`group()` from flutter_test does not support `skip` even though it's documented

[zoechi]

https://github.com/flutter/flutter/blob/master/packages/flutter_test/lib/src/test_compat.dart#L195-L197

https://github.com/flutter/flutter/blob/master/packages/flutter_test/lib/src/test_compat.dart#L233

Similar with all other documented parameters.

A project where I used skip shows now an error. I haven't worked on this project for about 6 months and can't tell when exactly it broke.

[✓] Flutter (Channel master, v1.2.1-pre.142, on Mac OS X 10.14.3 18D42, locale en-AT)

[github-actions]

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