Freeze "maniphest.gettasktransactions" and make status/priority transactions more consistent
Summary:
Ref T13020. See PHI221.
Freeze legacy method `maniphest.gettasktransactions` in favor of modern method `transaction.search`.
Remove legacy "null on create" behavior from Maniphest status and priority transactions. This behavior is obsolete with EditEngine, and leads to inconsistent transaction sets in the transaction record.
The desired behavior is that transactions which don't do anything (e.g., default value was not changed) don't appear in the transaction log.
Test Plan:
- Viewed API UI and saw `maniphest.gettasktransactions` marked as "Frozen".
- Created a new task via web UI (without changing status/priority), queried transactions with `maniphest.gettasktransacitons`/`transaction.search`, no longer saw "null on create" no-op transactions in record.
- Web UI is unchanged, since these transactions were hidden before and now do not exist.
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13020
Differential Revision: https://secure.phabricator.com/D18777