Fix AppCompactorTest and add a presubmit TEST_RULE

Test will run as presubmit if AppCompactor.java is modified.

Modifying server/TEST_MAPPING to add "include-filter":
"com.android.server." to make sure it still runs as expected.

Bug: 128613287
Bug: 129341058

Test: atest --test-mapping [while in com/android/server/am/]
Test: atest FrameworksMockingServicesTests:AppCompactorTest
Change-Id: I6238f83c0f94d9a9ca593ddab5169667150a5583