Remove job notifications on user stop.

Remove any notifications posted by an app via
JobService#setNotification() if the user stops the app for any reason.

Bug: 260848384
Bug: 261999509
Test: atest CtsJobSchedulerTestCases:NotificationTest
Test: atest FrameworksMockingServicesTests:JobNotificationCoordinatorTest
Change-Id: Icf034201dcefe8b5934e0b1b6041515f3c22bc3b