* auth: Implement is_restricted_user for OIDC and allow super users to create content regardless of set restriction (PROJQUAY-8208)
Currently, if OIDC is set as an authentication mechanism and restricted users is set, Quay will return a `501 Not Implemented` on invocation. Now, Quay will properly check the restricted user whitelist for federated users.
Additionally, if user restriction is in place and super user's username was **not** explicitly whitelisted, super users would not be able to create new content inside the registry. Now, the username is explicitly checked in the UI to allow super users to create both organizations and repos regardless of restricted users whitelist.
* Add tests
* Add tests for usermanager
