Allow task statuses to have claiming disabled

Summary:
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?

Test Plan:

• Closed a task as invalid: no claim.
• Closed a task as resolved: claim.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10343

Differential Revision: https://secure.phabricator.com/D15257