[ADI][22/N] remove verifier override option

The override via shell command is no longer needed now that we have
cts-root tests. Remove it to prevent potential abuse.

FLAG: android.content.pm.verification_service
BUG: 360129657
Test: atest CtsRootDeveloperVerificationVerifierTestCases

Merged-In: I2f5a6b64e2967a8d435898489b3a68a70cba43f4
Change-Id: I2f5a6b64e2967a8d435898489b3a68a70cba43f4