Revert "Allow shared users to rotate signing certs in an OTA"

This reverts commit ffd979d6b90a2780e8d625f7c65e5a8680ceb6ba.

Reason for revert: Replacing with go/oag/673735
Bug: 74501739
Test: N/A

Change-Id: I9e87b0f815081a196218744653542a29939c82bb
1 file changed