Listening to package broadcast on all users

When a package is added or removed on a secondary user, the broadcast
was not being processed, leading to inconsistent state, like lingering
defunt alarms and stale exact alarm candidates.

Also reordered some switch-case statements for better readability.

Test: atest FrameworksMockingServicesTests:com.android.server.alarm

Bug: 218868406
Change-Id: I1f1b9a5b8f63d6564c9e121bee7d6d6d697b471d