Reland - Update OutlinedButton tests for Material 3 (flutter#136809) (flutter#137247)

This relands flutter#136809 (it was reverted in flutter#137242)
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Updated unit tests for `CircleOutlinedButton` to have M2 and M3 versions.

More info in flutter#127064

This also gets rid of unnecessary `fromSwatch` usage (part of flutter#132584 documentation and test cleanup)

Author: TahaTesser