When a JobWaiter times out, the caller doesn't know that all the jobs
have completed. This is particularly important for the
AuthorizedProjectsWorker, which is called with a timeout of 10 seconds
from various controllers.

In order to improve that worker, we first want to track how often these
waiters time out, as compared to how often we attempt to wait. Based on
the results, we can consider different approaches to making this meet
its timeout more frequently.