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.

Currently CMake is tested entirely through `build_linux_test.dart`. However, CMake is also used for Windows builds. This adds additional "generic" tests:

1. Parsing CMake files
2. Generating CMake config files.

In the future, this will be used to test that generated CMake config files contain the expected version information, which will be used to flow version information to Windows executables.

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