R1:40cc403d2385

Allow the Trigger daemon to hibernate, reducing processes to 0

Summary:
Ref T12298. The trigger daemon already has routine long-term sleep, and few external events can impact when it should ideally wake up. The relevant events are:

- Someone creates a new Nuance source (ideally, we should wake up right away and start polling it).
- Someone creates a Calendar event about 16 minutes in the future (ideally, we should send them a reminder in about a minute).
- Someone changes GC config to be extremely…