Windows start up test
This test verifies that Flutter draws a frame before the Windows app is shown.
Add a basic integration test for the Windows's app startup. In a subsequent change (https://github.com/flutter/flutter/pull/109816), this test will be updated to verify the app's window isn't visible until after the first frame has been drawn. Part of https://github.com/flutter/flutter/issues/41980
HIAST - GitLab