RRO: Fix black screen flashes for splits

Downloading splits of an app while the app is open lead to black screen
flashes because apps would relaunch unnecessarily. This
change allows OMS to have correct state about targets while no longer
sending OVERLAY_CHANGED events or relaunching activities when packages
are changed or upgraded.

Bug: 79376331
Test: App provided in b/79376331 and regression testing of previous
black screen flash problems
Change-Id: I6e725dbe44b910959bc14304801b314024d9e831