flutter_desktop_darwin_unittests is disabled in debug builds since it is flakey #127441
Description
I tried to turn flutter_desktop_darwin_unittests debug tests back on with all the other tests but it failed randomly.
Example failures: https://ci.chromium.org/ui/p/flutter/builders/try/Mac%20Engine%20Drone/196691/overview
Maintained disabled state in flutter/engine#42261