Automatically remove other owned overrides when package override flag changes

At the moment we are using remove entries in the package override flags to indicate that an override is no longer needed, this changes removes that logic and instead adds support for automatically removing overrides whose change ID is in the owned_changed_ids flag but not in the package override flag each time that flag changes.

Bug: 201058202
Test: atest FrameworksMockingServicesTests:AppCompatOverridesParserTest
Test: atest FrameworksMockingServicesTests:AppCompatOverridesServiceTest
Change-Id: I064e726e5291556ebdfddba6b2a8b1492068d74b