Revert "flutter_tools: Remove unused //ignore comments; change flutter-specific ones to "ignore_for_flutter" (#45917)" (#46999)

This reverts commit f2859201.

It broke forbidden_imports_test, which uses a custom ignore directive.

flutter_tools: Remove unused //ignore comments; change flutter-specific ones to "ignore_for_flutter" (#45917)

* Update project.pbxproj files to say Flutter rather than Chromium

Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.

* Update the copyright notice checker to require a standard notice on all files

* Update copyrights on Dart files. (This was a mechanical commit.)

* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.

Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).

* Clean up the copyrights in non-Dart files. (Manual edits.)

Also, make sure templates don't have copyrights.

* Fix some more ORGANIZATIONNAMEs

This reverts commit 2135e9fb.

This reverts commit 6d77996d.

This reverts commit 3597bae6.

...because otherwise, processes that think they're manipulating your
filesystem will be doing crazy things the test is ignoring, leading to
(at best) failures and (at worst) flakes or disk corruption.

* dont update last compiled time when compilation is rejected

* lets try flushing, thats a neat trick

* windows man

* Update hot_reload_test.dart

* Update hot_reload_test.dart

* Update devfs.dart

* Update hot_reload_test.dart

* Update hot_reload_test.dart

* add test that verifies when compile is good that time is updated

* Update devfs_test.dart

* add missing trailing commas

* add more missing trailing commas

* add more and more missing trailing commas

* Retry devfs uploads in case they fail.

Fixes #34959.

Move tools tests into a general.shard directory in preparation to changing how we shard tools tests (#36108)

This reverts commit 445505d6.

This relands flutter/flutter#33163 with a fix to the integration_ui test.

* Clean up some flutter_tools tests

* Remove arbitrary retry that happens even for fundamental errors, and generally clean up _DevFSHttpWriter.

* Update dependencies (requires fixes; see next commit)

* Fixes for new dependencies.

* Use source list from the compiler to track invalidated files.

* Revert accidental change

* Fix first-time-seen-the-file logic

* Fix/simplify invalidate logic now that we can rely on compiler to let us know what is the cut-off point for invalidation.

* Update devfs mock to accommodate for new fields

* Fix deleted files case

* Analyzer found missing final

* add trailing commas on list/map/parameters

* add trailing commas on Invocation with nb of arg>1

* add commas for widget containing widgets

* add trailing commas if instantiation contains trailing comma

* revert bad change

* Collect devfs stats for better analytics

* Fix fields initialization

* Fix lints

Ensure that cached dill files for builds with --track-widget-creation
always have .track. in the file name to avoid mixing transformed and
untransformed kernel files.

Fixes #22451

* enable lint unnecessary_new

* fix tests

* fix tests

* fix tests