Please remove these from engine infra configs.

@ricardoamador @yusuf-goog as infra oncall

These bots are failing engine related tests, and we're finding we have to implement a bunch of work arounds in the infra config to try to avoid using them. There are only a few.

https://chromium-swarm.appspot.com/botlist?c=id&c=task&c=os&c=status&d=asc&f=gpu%3A8086%3A0a2e&f=pool%3Aluci.flutter.staging&k=pool&s=id and https://chromium-swarm.appspot.com/botlist?c=id&c=task&c=os&c=status&d=asc&f=gpu%3A8086%3A0a2e&f=pool%3Aluci.flutter.try&k=pool&s=id are the lists. None of these bots should run engine tests at all. They are fine for framework tests.

@zanderso @chinmaygarde fyi