Cleanup old Flutter recipes

[CaseyHillers]

There's been some refactors to the recipes where old infra configs are no longer used. We should remove these to cleanup the codebase.

[CaseyHillers]

https://flutter-review.googlesource.com/c/infra/+/15262
https://flutter-review.googlesource.com/c/infra/+/15261
https://flutter-review.googlesource.com/c/infra/+/15263
https://flutter-review.googlesource.com/c/recipes/+/15280

[github-actions]

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