Add test for anomaly detection in P

Lot of tests have been added already, this CL adds the missing tests
after robolectric upgrade.

Also add UID_NULL check in AnomalyDetectionJobService. It is almost
impossible to happen however we better catch it.

Bug: 73172999
Test: RunSettingsRoboTests
Change-Id: I950537efb166b0900393df1321ca64151b43e906