Reduce errors for managed services

Seen in on devices with work profiles.

- Only bind the the current started user(s)
- Wrap applyEnqueuedAdjustmentFromAssistant with a try/catch
since assistant services cannot recover from it on their own.

Additionally, while debugging this rebindServices hurt my brain,
so I've split it up a bit and added comments and tests.

Test: runtest systemui-notification, device restart and log queries
Bug: 113296846
Change-Id: I19b9044ff87712f9ef5401457217156ea9fb9f1f