Add test cases to test group policy for PACKAGE_CHANGED broadcast

Flag: android.content.pm.merge_package_changed_broadcast

Bug: 381949725
Test: atest BroadcastHelperTest
Test: atest PackageChangedBroadcastTest
Test: atest PackageChangedBroadcastGroupPolicyTest
Change-Id: I6c6c568e278fc94cec0752ca7e6a0e850d5b6e65
6 files changed