R1:f92059d84c6a

Migrate Project status to modular transactions

Test Plan: Unit tests pass. Archived/activated some projects a couple times; observed expected transactions on timeline.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D17953