Revert "[EditableText] call `onSelectionChanged` only when there're actual selection/cause changes (#87971)" (#88183)

* Adding a timeout and retry to upload results step.

* Adding tests for retries and timeout.

* Adding async to call

* Fixing sleep to trigger the timeout, and adding addition timeout test.

* Fixing minor typo.

* Fixing some minor flutter style issues.

* Adding vs_build dependency to Windows hot_mode_dev_cycle_win_target__benchmark
Co-authored-by: yusufm <mohsinally@google.com>

This reverts commit 91e0759b.

Moving the focus with the tab key on the external keyboard will move the focus to the widget that is hidden by AnimatedCrossFade.

Corrects the exact definition in code and docs of ScaleUpDetails delta.

Support for more desktop keyboard keys/shortcuts.

Switch document generation to use the snippets package instead of the snippets code in the Flutter repo. In the process, some bugs in sample code analysis have been fixed, and I've fixed some more errors in the samples.

This will allow the snippets package to be developed separately from the Flutter repo, and reduce the code in the Flutter repo.

The snippets code is deleted in this PR.

I also converted some comments in the snippet templates to be regular comments instead of doc comments, because having a doc comment block before the imports causes the Dart import sorter to lose the comment. They should have been regular comments in the first place.

The snippets package resides in the assets-for-api-docs repo.

The sample analysis has also been converted to be run in parallel, and I've bumped the Dartdoc version to 1.0.2.

This reverts commit 724c0eb6.

This will still run the workflow in forks but it will exit immediately
if the repository is not flutter/flutter.

Bug: https://github.com/flutter/flutter/issues/87573