[ADI][20/N] protect the verifier app

Makes sure it cannot be disabled/suspended/uninstalled.

FLAG: android.content.pm.verification_service
BUG: 360129657
Test: atest android.content.pm.cts.VerifierServiceTest

Merged-In: I0872073bb9110fd7994437dee455090edc9f8355
Change-Id: I0872073bb9110fd7994437dee455090edc9f8355