Before #717 GenericOAuthenticator was the odd duck allowing username_claim to be callable, but after that PR CILogonOAuthenticator becomes the odd dock by not allowing its username_claim implementation to be callable.
For consistency, we should make it callable, and by doing that resolve #712 by doing so.
Before #717 GenericOAuthenticator was the odd duck allowing
username_claimto be callable, but after that PR CILogonOAuthenticator becomes the odd dock by not allowing itsusername_claimimplementation to be callable.For consistency, we should make it callable, and by doing that resolve #712 by doing so.