To opt-in, run the tests with: `SKPARAGRAPH_REMOVE_ROUNDING_HACK=1 flutter test --dart-define=SKPARAGRAPH_REMOVE_ROUNDING_HACK=1 `

Migration plans:
1. Turn the flags on in CI, migrate customer tests if needed
1. Migrate internal customers
2. Remove the flag from skparagraph. Remove the framework flag with a manual engine roll.

Also fixes https://github.com/flutter/flutter/issues/52038