Allow task statuses to have claiming disabled
Fixes T10343. All solutions here seem basically fine. I think adding this small bit of complexity is OK, and sorrrrt of like this behavior sometimes.
- Allow disabling this behavior per-status.
- Disable it by default for "Invalid" and "Duplicate" (I left "wontfix", since that's a resolution?).
Beyond being more flexible, I think this is slightly better?
- Closed a task as invalid: no claim.
- Closed a task as resolved: claim.
Reviewed By: chad
Maniphest Tasks: T10343
Differential Revision: https://secure.phabricator.com/D15257