Diff overlays between PackageManagerService and OverlayManagerService

When uninstalling an update to a system app, PMS re-creates the
PackageSetting object, and OMS doesn't get notified of the change.

This makes OMS diff the known valid overlays with the resourceDirs
in the target's ApplicationInfo and forces a reload when they
disagree.

Bug: 124363683

Test: manual ran Wellbeing reproduction steps in bug

Change-Id: Ib080d8593d12596ae8f8a729cc9740462c4b9b69