Restore some minor state behaviors to Differential on EditEngine
Summary:
Ref T11114. This restores:
- Commandeering should exeucte Herald.
- Commandeering should swap reviewers.
- "Request Review" on an "Accepted" revision should downgrade reviewers so they have to accept again.
Test Plan:
- Commandeered, saw Herald run and reviewers swap.
- Requested review of an accepted revision, saw it drop down to "Needs Review" with "Accepted Prior" on the reviewer.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T11114
Differential Revision: https://secure.phabricator.com/D17118