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.

• 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.