use format and lint only from linux. It broke Mac bots since we were running it before Setup Xcode.
This steps used to be only in Linux Cirrus tasks to reneable them by only running on Linux

Linux Host: https://chromium-swarm.appspot.com/task?id=4d72642fdaa38e10

Linux Web: https://chromium-swarm.appspot.com/task?id=4d7264145d53a910

Mac Web: https://chromium-swarm.appspot.com/task?id=4d72646d49717110

Change-Id: I9bf76b79d6ad560b2896aa4a06df608f62602715
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/4380
Reviewed-by: Dan Field <dnfield@google.com>
Commit-Queue: Nurhan Turgut <nurhan@google.com>