This was testing that concurrent reloads were rejected. This is now allowed (as of #55376 (which has non-devicelab integration + unit tests).

Remove git dependencies from pub-cache

#61487

* Promtoe WidgetTester.ensureVisible

* modify according to tvolkert@

https://github.com/flutter/flutter/issues/61496

The function passes most of its arguments through to
`_DialogRoute`, but it wasn't providing the default
values that `_DialogRoute` was, causing it to override
the defaults will null values.

The Xcode build almost always takes longer than 2 seconds. With the
operation classified as a "fast operation", the Flutter tool will
warn the user that the build is "taking an unexpectedly long time".
This updates the operation to be a "slow operation", which will only
warn the user if it takes 2+ minutes.

Allow configuring the flutter_manifest to support a synthetic package, this is done through flutter: generate: true.

When running pub get, insert a flutter_gen entry into the packages if it does not already exist. This points to .dart_tool/flutter_gen, which can be updated to contain the generated intl sources (But doesn't currently)

Adds an integration test that verifies this code can be run and imported when enabled.

Part of #60914

* Fixing patch for coming breaking change in HttpClientRequest

* Add noSuchMethod() and comment out abort()

* Add ignore: override_on_non_overriding_member

Add document for mouse cursor mapping on Windows and Linux.

* migrate foundation to nullsafety

* address review comments

Enable null safety asserts for web debug mode. This induces runtime asserts at the boundaries between null safe and non-null safe libraries. Adds integration test that validates assertion error is thrown.

#61042

Revert "Reland "Add support for Dart Development Service (DDS) in Flutter Tools (#61276)" (#61395)" (#61498)

This reverts commit f98184e4.

This reverts commit 5b9c6e2b.