[ADI][43/N] preserve developer verification policy across reboots

+ Cleanup stale permission annotations
+ Preserve per-user developer verification policy to disk
+ Unit tests

BUG: 360129657
FLAG: android.content.pm.verification_service
Test: atest com.android.server.pm.PackageInstallerServiceTest

Change-Id: I1430ba5ba6cf72634a430323d6e3da7894ed9a94