Update buildable containerPHIDs in a proper way via BuildWorker rather than via sneaky uncoordinated write master
Summary: Depends on D19065. Ref T13054. Instead of just updating `containerPHID` and hoping for the best, queue a proper BuildWorker to process a "your container has changed, update it" message. We also need to remove a (superfluous) `withContainerPHIDs()` when loading active diffs for a revision. Test Plan: - Without daemons, created a revision and saw builds stick in "preparing" with no container PHID, but also stay in draft mode. - With daemons, saw builds actually build and get the right container PHID. Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam Maniphest Tasks: T13054 Differential Revision: https://secure.phabricator.com/D19066