R1:6f508a225869

Update buildable containerPHIDs in a proper way via BuildWorker rather than via sneaky uncoordinated write

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…