Reduce number of OCI registries used for e2e tests

[ikhandamirov]

Description:

Requested here and here.

The original e2e tests sets up one unprotected OCI registry. The e2e test of the replication controller added two more password-protected registries.

The suggestion is to "create 2 registries that are both protected and change the original registry to be protected. That way we don't need 3". I.e. one of the protected registries will be used for both the original test as well as for the test of the replication controller. In this case the third registry can be dropped.

Done Criteria:

• Code has been reviewed by other team members
• Existing e2e tests continue to run successfully.