Run all tests on Windows

[goderbauer]

Currently, we are skipping some tests on the Windows platform because they are hitting features that are not yet implemented on Windows.

Filing this issue as a placeholder to make sure we enable those tests when we are ready on Windows.

To find them, just search for skip: Platform.isWindows or skip: io.Platform.isWindows in the code base.

[goderbauer]

We also need to run these tests on the Chromebots, which is currently blocked by not having Java on the Windows bots.

[goderbauer]

Quick update:

• All tests except for those requiring sky_snapshot or sky_shell are now run-able on Windows.
• We run our test suite on Windows via appveyor for every PR (runs same set of tests as Travis).
• The Linux, Windows, and Mac Chromebots now all do the same thing (run test suite and build example apps).

The only thing left to do for this issue: Enable tests requiring sky_shell or sky_snapshot on Windows once those two are available for the platform.

[goderbauer]

After #8512 has been submitted, the only remaining tests not running on Windows are those requiring sky_shell. We are getting pretty close to parity with Linux/Mac on the testing front!

[goderbauer]

Further work on this is blocked by #8516.

[goderbauer]

This has been done.

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.