Remove autosubmit config files that are no longer being used. This was from a previous design and not longer used.

*List which issues are fixed by this PR. You must list at least one issue.*
Part of https://github.com/flutter/flutter/issues/130182

*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*

https://github.com/flutter/engine/compare/893ab3bf7bb9...40a8732a5de0

2023-07-07 skia-flutter-autoroll@skia.org Roll Skia from 93c92f97f5ab to 2885452c3fb1 (2 revisions) (flutter/engine#43478)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

https://github.com/flutter/engine/compare/b39e6fe4b3bf...893ab3bf7bb9

2023-07-07 skia-flutter-autoroll@skia.org Roll Dart SDK from 0b07debd5862 to 4998bf65f91c (2 revisions) (flutter/engine#43480)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

https://github.com/flutter/engine/compare/7c83ea3e8542...b39e6fe4b3bf

2023-07-07 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from Cfxhimvf7nMO99ky_... to vee6hAD_43mq_4FS7... (flutter/engine#43475)

Also rolling transitive DEPS:
  fuchsia/sdk/core/linux-amd64 from Cfxhimvf7nMO to vee6hAD_43mq

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Add a threshold when comparing screen order for selectables. So when the vertical position diff is within the threshold, will compare the horizontal position.

This fixes https://github.com/flutter/flutter/issues/111021 and https://github.com/flutter/flutter/issues/127942

Manual roll is needed because incoming dart sdk requires updated version
vm_snapshot_analysis (>=0.7.4).


https://github.com/flutter/engine/compare/5ae09b8b4fa381e8723ed5382a26eafd0d97236f...7c83ea3e854202aea22405a947ac1b8f18c5a72c

```
7c83ea3e85 Reland "Manual roll Dart SDK from 2d98d9e27dae to 0b07debd5862 (21 revisions) (#43457)" (#43472)
9ef3e8d533 Roll Skia from 5eba922297bb to 93c92f97f5ab (2 revisions) (#43471)
```

Remove implementation of SuitePlatform from the test as well. Remove use
of fake cwd from SuitePlatform as it can't be properly faked.

Reverts flutter/flutter#127776
Currently breaking google testing

<img width="919" alt="image" src="https://github.com/flutter/flutter/assets/42003129/4bc8c3b8-29af-4b98-9232-47a583523e3c">
I was installing Flutter and noticed that the download link for Xcode is incorrect. They might have changed it, but the current link doesn't exist.

https://github.com/flutter/packages/compare/9bcf4bfa493f...b61eea12dbf9

2023-07-07 aam@google.com Roll pigeon dependency to unblock flutter framework deps roll (flutter/packages#4383)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-packages-flutter-autoroll
Please CC flutter-ecosystem@google.com,rmistry@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Allows positioning Autocomplete options above the field (previously hardcoded to under the field).

You know, I like to see beautiful code, so really hope we have auto formatter, such that all these (at least such formatting error) can be done automatically!

https://github.com/flutter/engine/compare/8aa2e6516af1...5ae09b8b4fa3

2023-07-07 aam@google.com Revert "Manual roll Dart SDK from 2d98d9e27dae to 0b07debd5862 (21 revisions) (#43457)" (flutter/engine#43466)
2023-07-07 skia-flutter-autoroll@skia.org Roll Skia from 7a3a89fadc25 to 5eba922297bb (1 revision) (flutter/engine#43464)
2023-07-07 skia-flutter-autoroll@skia.org Roll Skia from adf5b9c27c33 to 7a3a89fadc25 (1 revision) (flutter/engine#43462)
2023-07-07 skia-flutter-autoroll@skia.org Roll Fuchsia Mac SDK from 3D0ft09qP4-Hp_3mQ... to MPy31yjgPV-d_YJq0... (flutter/engine#43460)
2023-07-07 skia-flutter-autoroll@skia.org Roll Skia from 57dc2a31bf26 to adf5b9c27c33 (2 revisions) (flutter/engine#43459)
2023-07-07 skia-flutter-autoroll@skia.org Roll Skia from 11a2eefe4c61 to 57dc2a31bf26 (1 revision) (flutter/engine#43456)
2023-07-07 skia-flutter-autoroll@skia.org Manual roll Dart SDK from 2d98d9e27dae to 0b07debd5862 (21 revisions) (flutter/engine#43457)

Also rolling transitive DEPS:
  fuchsia/sdk/core/mac-amd64 from 3D0ft09qP4-H to MPy31yjgPV-d

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Adding debugging for https://github.com/flutter/flutter/issues/129836.

Takes a screenshot when startup test takes too long (10 minutes).

Also, removes some old debugging and add new debugging message.

Reverts flutter/flutter#114303

The breaking API change in flutter/flutter#114303 broke internal tests/apps (Google internal link b/290154304) as well as external dependents: https://github.com/flutter/flutter/issues/130062. 

Fixes https://github.com/flutter/flutter/issues/130062

https://github.com/flutter/packages/compare/771ec9b42a38...9bcf4bfa493f

2023-07-07 stuartmorgan@google.com [ci] Add LUCI web platform tests (flutter/packages#4391)
2023-07-07 stuartmorgan@google.com [webview_flutter] Enable unawaited_futures lint (flutter/packages#4271)
2023-07-07 stuartmorgan@google.com [ci] Add partial LUCI version of repo_checks (flutter/packages#4389)
2023-07-06 49699333+dependabot[bot]@users.noreply.github.com Bump ossf/scorecard-action from 2.1.3 to 2.2.0 (flutter/packages#4302)
2023-07-06 10687576+bparrishMines@users.noreply.github.com [webview_flutter_android][webview_flutter_wkwebview] Fixes unawaited_futures violations (flutter/packages#4354)
2023-07-06 stuartmorgan@google.com [local_auth] Update Windows Pigeon version (flutter/packages#4388)
2023-07-06 77553258+victorsanni@users.noreply.github.com [url_launcher] Remove nested third_party safari checker (flutter/packages#4330)
2023-07-06 stuartmorgan@google.com [ci] Add partial LUCI Android platform tests (flutter/packages#4381)
2023-07-06 stuartmorgan@google.com [ci] Switch `master` Linux custom package tests to LUCI (flutter/packages#4386)
2023-07-06 47866232+chunhtai@users.noreply.github.com [go_router] Exposes package-level privates (flutter/packages#4380)
2023-07-06 stuartmorgan@google.com [file_selector] Update to 1.0 (flutter/packages#4362)
2023-07-06 engine-flutter-autoroll@skia.org Roll Flutter from 35085c39 to bc49cd1b (14 revisions) (flutter/packages#4387)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-packages-flutter-autoroll
Please CC flutter-ecosystem@google.com,rmistry@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

https://github.com/flutter/engine/compare/650ff096488a...8aa2e6516af1

2023-07-07 dnfield@google.com [Impeller] Duplicate include removal from lazy_glyph_atlas.cc. (flutter/engine#43453)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

https://github.com/flutter/engine/compare/1fa222fae283...650ff096488a

2023-07-07 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from MEXi9Xyj7u24PSx_J... to Cfxhimvf7nMO99ky_... (flutter/engine#43454)
2023-07-07 zanderso@users.noreply.github.com Reduce redundant Linux clang-tidy work and run on more cores (flutter/engine#43448)
2023-07-07 jason-simmons@users.noreply.github.com [Impeller] Set up the clear color for non-MSAA render targets. (flutter/engine#43452)

Also rolling transitive DEPS:
  fuchsia/sdk/core/linux-amd64 from MEXi9Xyj7u24 to Cfxhimvf7nMO

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

https://github.com/flutter/engine/compare/491f317978f4...1fa222fae283

2023-07-06 skia-flutter-autoroll@skia.org Roll Skia from 072dfcc435de to 11a2eefe4c61 (5 revisions) (flutter/engine#43451)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

https://github.com/flutter/engine/compare/48bf7ac59254...491f317978f4

2023-07-06 chinmaygarde@google.com Account for updated Impeller label. (flutter/engine#43450)
2023-07-06 bdero@google.com [Impeller] Fix DrawPicture. (flutter/engine#43446)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

https://github.com/flutter/engine/compare/42df55a9e63e...48bf7ac59254

2023-07-06 john@johnmccutchan.com Eagerly remove the PlatformView from the view hierarchy on Android (flutter/engine#43423)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Removed two unnecessary `if` conditions.

https://github.com/flutter/engine/compare/06c936205d96...42df55a9e63e

2023-07-06 skia-flutter-autoroll@skia.org Roll Skia from 10a43e57e0a6 to 072dfcc435de (2 revisions) (flutter/engine#43445)
2023-07-06 dkwingsmt@users.noreply.github.com Remove dead code for recreating a11y node delegates (flutter/engine#43359)
2023-07-06 737941+loic-sharma@users.noreply.github.com [macOS] Fix assertion typo (flutter/engine#43179)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Manual roll Flutter Engine from bd2e42b203e1 to 06c936205d96 (27 revisions)

Manual roll requested by zra@google.com

https://github.com/flutter/engine/compare/bd2e42b203e1...06c936205d96

2023-07-06 dnfield@google.com Handle nested display list clips in Impeller dispatcher (flutter/engine#43442)
2023-07-06 louiseh0313@gmail.com Add Look Up to iOS selection controls (flutter/engine#43308)
2023-07-06 skia-flutter-autoroll@skia.org Roll Skia from 6aaef9cbc3af to 10a43e57e0a6 (1 revision) (flutter/engine#43444)
2023-07-06 skia-flutter-autoroll@skia.org Roll Skia from 620de5ac9f6b to 6aaef9cbc3af (1 revision) (flutter/engine#43441)
2023-07-06 ychris@google.com Revert "[iOS][Keyboard] Wait vsync on UI thread and update viewport inset to avoid jitter." (flutter/engine#43422)
2023-07-06 skia-flutter-autoroll@skia.org Roll ICU from a2961dc659b4 to e8c3bc9ea97d (7 revisions) (flutter/engine#43440)
2023-07-06 zanderso@users.noreply.github.com Further shard clang-tidy runs (flutter/engine#43428)
2023-07-06 dnfield@google.com Release log capture at end of test (flutter/engine#43429)
2023-07-06 skia-flutter-autoroll@skia.org Roll Fuchsia Mac SDK from uGhka7LBG80dM_I3a... to 3D0ft09qP4-Hp_3mQ... (flutter/engine#43439)
2023-07-06 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from amH2MWTworhTLdMWy... to MEXi9Xyj7u24PSx_J... (flutter/engine#43438)
2023-07-06 109111084+yaakovschectman@users.noreply.github.com Use Windows Display Language (flutter/engine#43341)
2023-07-06 skia-flutter-autoroll@skia.org Roll Skia from b2ba6e1d8c0e to 620de5ac9f6b (2 revisions) (flutter/engine#43437)
2023-07-06 skia-flutter-autoroll@skia.org Roll Skia from 50e866b51a64 to b2ba6e1d8c0e (2 revisions) (flutter/engine#43436)
2023-07-06 skia-flutter-autoroll@skia.org Roll Skia from 8ed969b60e98 to 50e866b51a64 (1 revision) (flutter/engine#43435)
2023-07-06 737941+loic-sharma@users.noreply.github.com Fix typo in painting.dart (flutter/engine#43378)
2023-07-06 skia-flutter-autoroll@skia.org Roll Fuchsia Mac SDK from C3Q7MJBYkiin8zw-f... to uGhka7LBG80dM_I3a... (flutter/engine#43433)
2023-07-06 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from iwgWLB4KaXslnaGwK... to amH2MWTworhTLdMWy... (flutter/engine#43432)
2023-07-05 skia-flutter-autoroll@skia.org Roll Skia from a39421eb8d7b to 8ed969b60e98 (6 revisions) (flutter/engine#43431)
2023-07-05 jonahwilliams@google.com [Impeller] Allocate fewer textures in dedicated memory and adjust buffer flags. (flutter/engine#43313)
2023-07-05 skia-flutter-autoroll@skia.org Roll Skia from d6e941012b87 to a39421eb8d7b (4 revisions) (flutter/engine#43427)
2023-07-05 skia-flutter-autoroll@skia.org Roll Skia from e0b9e047332d to d6e941012b87 (2 revisions) (flutter/engine#43424)
2023-07-05 ychris@google.com [iOS] Avoid crash when backdrop filter is null for PlatformViews (flutter/engine#43150)
2023-07-05 skia-flutter-autoroll@skia.org Roll Skia from 401c397f7235 to e0b9e047332d (1 revision) (flutter/engine#43420)
2023-07-05 737941+loic-sharma@users.noreply.github.com [Windows] Fix `FlutterWindow::GetNativeViewAccessible` crash (flutter/engine#43368)
2023-07-05 linxunfeng@yeah.net [iOS] Fix FlutterViewController retain cycle (flutter/engine#43379)
2023-07-05 skia-flutter-autoroll@skia.org Roll Skia from 23052eb28808 to 401c397f7235 (1 revision) (flutter/engine#43419)
2023-07-05 skia-flutter-autoroll@skia.org Roll Skia from d58324bf653d to 23052eb28808 (3 revisions) (flutter/engine#43418)

Also rolling transitive DEPS:
  fuchsia/sdk/core/linux-amd64 from iwgWLB4KaXsl to MEXi9Xyj7u24
  fuchsia/sdk/core/mac-amd64 from C3Q7MJBYkiin to 3D0ft09qP4-H

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC aaclarke@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
...

<!-- meta-tags: To be used by the automation script only, DO NOT MODIFY.
{
  "name": "Linux firebase_oriol33_abstract_method_smoke_test"
}
-->
The test has been passing for [50 consecutive runs](https://data.corp.google.com/sites/flutter_infra_metrics_datasite/flutter_check_test_flakiness_status_dashboard/?p=BUILDER_NAME:%22Linux%20firebase_oriol33_abstract_method_smoke_test%22).
This test can be marked as unflaky.

Adds optional visual labels to Cupertino's on/off switch for accessibility.

This pull request introduces the `buildFlexibleSpace` method to the `SearchDelegate` class in the material library. 
It allows users to add a flexible space widget to the `AppBar` in a `_SearchPage`, providing more customization options.

This PR does not fix any specific issue as there are no open issues related to this feature.

https://github.com/flutter/packages/compare/704207985a21...771ec9b42a38

2023-07-06 stuartmorgan@google.com [ci] Enable LUCI Dart unit tests (flutter/packages#4378)
2023-07-06 stuartmorgan@google.com [ci] Bring up LUCI Linux custom package tests (flutter/packages#4382)
2023-07-06 tarrinneal@gmail.com [pigeon] adds generate option for example pigeons (flutter/packages#4370)
2023-07-06 47866232+chunhtai@users.noreply.github.com [go_router] Allows redirect only GoRoute to be part of RouteMatchList (flutter/packages#4315)
2023-07-06 49699333+dependabot[bot]@users.noreply.github.com [sign_in]: Bump com.google.android.gms:play-services-auth from 20.5.0 to 20.6.0 in /packages/google_sign_in/google_sign_in_android/android (flutter/packages#4359)
2023-07-06 41930132+hellohuanlin@users.noreply.github.com [pigeon]fix a crash when casting NSNull to an Array (flutter/packages#4289)
2023-07-06 hello@kamil.id [google_sign_in_web] Fixes force unwrap on values that can be null (flutter/packages#4374)
2023-07-05 engine-flutter-autoroll@skia.org Roll Flutter from 590ef2d4 to 35085c39 (3 revisions) (flutter/packages#4379)
2023-07-05 43054281+camsim99@users.noreply.github.com [camerax] Fixes `unawaited_futures` violations (flutter/packages#4337)
2023-07-05 stuartmorgan@google.com [ci] Remove `starqlteue` from FTL tests (flutter/packages#4375)
2023-07-05 stuartmorgan@google.com [tools] Switch to `flutter test` (flutter/packages#4348)
2023-07-05 joshuapetitma@yahoo.com [flutter_markdown] Add TableCellVerticalAlignment property in markdown stylesheet (flutter/packages#3880)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-packages-flutter-autoroll
Please CC flutter-ecosystem@google.com,rmistry@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

iOS OCR keyboard input support.

[flutter_tools] modify Skeleton template to use ListenableBuilder instead of AnimatedBuilder (#128810)

Replaces AnimatedBuilder for ListenableBuilder in the skeleton template

Fixes https://github.com/flutter/flutter/issues/128801

No tests needed

Previously, if you changed buttons during a long-press gesture, if it was before the gesture was accepted we would discard it, and if it was after the gesture was accepted we would silently end it without firing any of the relevant events.

This silent cancelation behavior is terrible because it means there's no way for consumers to know what state they're in, so you end up with widgets that thing they're still being long-pressed even though nothing is happening.

We could change the behavior in three ways, as far as I can tell:

- we could send a cancel event when you change buttons. This would introduce a new kind of transition (start->cancel) which I don't think we currently require people to support. This would therefore not fix existing code and would make future code more complicated to handle a really obscure user action that it seems unlikely anyone cares about.

- we could send an end event when you change buttons. This would mean the action commits, even though the user is still holding the mouse button down. This seems slightly better than the previous option but still not ideal as it means nudging the mouse button commits you even though you're still holding the button down.

- we could ignore button changes after the long-press has been accepted.

I implemented the last one in this PR.

PLUS: clean-up of all the unreachable stuff.

q.v. https://flutter.dev/go/triage-2023-rfc

Reland https://github.com/flutter/flutter/pull/129556/ which had failed
an internal test (see Google internal link b/288993600) and was reverted
in https://github.com/flutter/flutter/pull/129645.

This PR must be landed with G3 Fix cl/543755631

This more closely matches our other conventions.

Removes deprecated APIs from v2.6 in `binding.dart` and `widget_tester.dart`

Resolves #129654