[co19] Skip broken tests also in co19_2
[co19] Skip broken tests also in co19_2

https://github.com/dart-lang/co19/issues/1137

Change-Id: I32e81daed87ad8943023ad923fddd686b3b2362e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/209961
Reviewed-by: William Hesse <a821cddceae7dc400f272e3cb1a72f400f9fed6d@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk