Add an integration test that verifies that `flutter build windows` produces the expected executable. In the future, this will be used to test that version information is properly stamped on the executable.

Part of https://github.com/flutter/flutter/issues/73652.

* d30c46036 make fractional translation the default for desktop/tester (flutter/engine#34115)

* 8cf1560b6 Remove no-op flag from fidlc response gen (flutter/engine#34110)

* Impl

* Test

* Impl

* Revert some changes

* More doc changes

* Remove legacy code

This reverts commit 9e67070f.

* readability refactor

* update post-submits

Update post submit testing status location from LUCI to cocoon.  Conductor users will still have to use navigation to pick the correct repository and release candidate to monitor.