R1:7f743c14d532

Remove remaining ArcanistDifferentialRevisionStatus references in revision state logic

Summary: Ref T2543. This cleans up all the "when no one is rejecting/blocking and someone accepted, mark the revision overall as accepted" logic to use more modern status stuff instead of `ArcanistDifferentialRevisionStatus`.

Test Plan:
- Updated revisions, saw them go to "Needs Review".
- Accepted, requested changes to revisions.
- Updated one with changes requested, saw it go to "needs review" again.

Reviewers…