Re-evaluate Entity API dependency and drop dead code.

Checking ✨ Implement a generic revision UI Fixed for revision counterparts in core.

Okay we can drop everything, but our revision UI tests now have 2 failures when we do. Need to investigate that.

So only RevisionUiAccessTest::testUpdateDeleteAccess() fails for non-default revisions when reverting. Will have to look into that.

This did bring to my attention that core (and now Group) use the'revert' operation, but node still uses 'revert revision'. So we may need to open an issue to adjust group_support_revisions to account for that.

Automatically closed - issue fixed for 2 weeks with no activity.