* [flutter_tools] partial revert of start app change

- run_without_leak_tests: have been disabled for months
- build_benchmark: the tooling work here is mostly done and we're not tracking further improvements, free up more devicelab capacity
- system_debug_ios: does not work post iOS13
- mac_enable_twc: not adding more mac tests to devicelab
- hello_world_start_up: disabled

Any tests that we think will be valuable in the future can be resurrected from the git history.

Revert "[flutter_tools] If run fails to install the application on iOS, try uninstalling it and trying again. (#68078)" (#68118)

This reverts commit 61ba7dd2.

[flutter_tools] If run fails to install the application on iOS, try uninstalling it and trying again. (#68078)

[Material] Parent checkbox in DataTable should deselect all, if children checkboxes are disabled or selected  (#67938)

* modify: add prefix `Alignment.` for toString of Alignment

Do not allow attach in release mode, as there is not VM Service to connect to. Observed in crash reporting as thrown string which is changed to exception below.

--use-application-binary allows running with an already built APK. This can be useful for speeding up CI test cases, or in our case eventually supporting some sort of build server. Demonstrate that this works by updating the old gallery test to use it. Fixes #56604
Co-authored-by: Jenn Magder <magder@google.com>

* Fix docset generation.

* Remove checks to be able to test.

* More logging

* More logging

* More logging.

* more logging.

* More logging.

* Add flags to firebase command.

* Re-enable docset generation.

* Disable firebase step.

* Comment docset to speed up validations.

* Re-enable docset.

* Add back condition to prevent uploading docs from PRs.

* Migrate more Material framework tests to null safety.

Migrating some more widget tests to NNBD.

Remove "This is taking a long time" progress timeout and TimeoutConfiguration.

* Migrate more tests

* fix

Fake has been moved from mockito to test to facilitate NNBD, re-export this from flutter_test

This class is entirely superseded by the application package factory. Only drive and install use it, and removing it from drive will allow use-application-binary support.

Android Studio 4.1 moved the location of the .home file on Windows which is used to located the install directory. This functionality is important because it is how we locate and discover the Android SDK functionality, as well as the appropriate JRE.

fixes #67986

This reverts commit 62cf4dbf.

This reverts commit daa6b2cc.

This PR will update IntelliJ IDEA/Community validation logic for 2020.1 and later on Linux and Windows.

* 85b0031f7 Migration to PlatformDispatcher and multi-window (flutter/engine#20496)

* 0d151816c Remove uses of Dart VM bytecode mode from Flutter engine (flutter/engine#21741)

* 8be6cc039 Roll Skia from 88cda17bbeb8 to 61003cde7688 (4 revisions) (flutter/engine#21744)

* a2046aeb6 Revert "fix On iOS, dialog titles are announced twice (#19826)" (flutter/engine#21714)

* 3bd695b18 Roll Skia from 61003cde7688 to 13fc260c7080 (1 revision) (flutter/engine#21746)

* ca250c972 Roll Fuchsia Mac SDK from lqn8xmlDn... to gzhbqRUap... (flutter/engine#21749)

* 7f0e17b67 Roll Skia from 13fc260c7080 to aa64c352b349 (1 revision) (flutter/engine#21752)

* d97e74c7c Roll Fuchsia Linux SDK from EBX49sN_X... to YRTc9YoiB... (flutter/engine#21753)

* 7fc1a0386 Roll Skia from aa64c352b349 to d71dc2d25b8b (1 revision) (flutter/engine#21758)

* a3f3f989a Roll Fuchsia Mac SDK from gzhbqRUap... to _0R2HD4c8... (flutter/engine#21759)

* d4b8d676f Roll Fuchsia Linux SDK from YRTc9YoiB... to Nw5-0_sVF... (flutter/engine#21760)

* 910ce92e6 Roll Fuchsia Mac SDK from _0R2HD4c8... to 82ankF-Ht... (flutter/engine#21762)

* bd03014c2 Roll Fuchsia Mac SDK from 82ankF-Ht... to FFpTJfmj1... (flutter/engine#21768)

* f230fded7 Use buildroot clang for scenario app (flutter/engine#21690)

* 766d68282 Roll Fuchsia Linux SDK from Nw5-0_sVF... to h-DeV4tgE... (flutter/engine#21771)

* cff4ee74a Roll Skia from d71dc2d25b8b to ceb6214a556a (5 revisions) (flutter/engine#21772)

* fd1ba9ccf Ignore analysis warning for doc comment (flutter/engine#21773)

* 978cfd6d5 Roll Skia from ceb6214a556a to 9213e610ed92 (8 revisions) (flutter/engine#21774)

* 106842989 Roll Dart SDK from 06536d68ca0f to e256855d07ba (6 revisions) (flutter/engine#21775)

* 190fd8eb5 Reland "Create root isolate asynchronously (#20142)" (flutter/engine#21747)

* 10ed56318 Roll Skia from 9213e610ed92 to 840e8ea7403e (11 revisions) (flutter/engine#21779)

* e18cd9687 Roll Skia from 840e8ea7403e to ab6e62c131e9 (7 revisions) (flutter/engine#21783)

* 931a04683 Fix documentation build for window changes. (flutter/engine#21780)

* 38d8ebaa4 E2e screenshot tests2 (flutter/engine#21383)

* d912d502d [null-safety] fix build rule to produce sound dill (flutter/engine#21784)

* 05d97932b Extract a TextRange class for selection (flutter/engine#21722)

* c2938d06b Revert "Migration to PlatformDispatcher and multi-window #20496" (flutter/engine#21792)

All of the network requests from google cloud storage include an x-goog-hash header which contains an MD5 checksum. If present, use to validate that the downloaded binary is valid. This will rule out corrupt files as the cause of getting started crashers in the flutter_tool.

#38980

This does not fully resolve the above issue, because while we can check if the checksum matches what was expected from cloud storage, this A) may not necessarily be present and B) may not match up to what should be uploaded as part of the engine build process.

But when life gives you lemons you hash those lemons using an outdated hashing algorithm.

A change which sped up hot restart locally caused many of the devicelab measures to regress. I think this is because we do not measure when the isolate is actually "ready", so starting a reload or restart prematurely can cause time spent doing initialization to be registered as part of the reload operation.

A fix for this would be to have the framework include some sort of "initialization complete" event ... but it is not clear what the correct trigger would be. Perhaps after the first frame is successfully registered?

(9a3a0dc1 caused the benchmark regression - possibly since we spend less time syncing files now so we start the restart earlier)

Migrates the following files to NNBD: 
* input_decorator_test.dart
* list_tile_test.dart
* localizations_test.dart
* material_button_test.dart
* material_state_property_test.dart
* material_test.dart
* mergeable_material_test.dart

* Expose date symbols and patterns for en_US in framework