[CFE] Skip failing flutter test on bot flutter-frontend
[CFE] Skip failing flutter test on bot flutter-frontend

Skip test that fails to compile because theres an error triggered by
constant evaluation because we're not compiling for a web-platform.
This should turn the bot green.

Change-Id: Icb7a4d5a55f14c146f03e17d06d518f615189e27
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/115205
Reviewed-by: Johnni Winther <0f64ef784d57ffb064b634040f9eeba0d33d0be4@google.com>
Commit-Queue: Jens Johansen <05223a3c6bdf76af6f84755eae231abeebcf4530@google.com>

dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk