Use cern_upn claim as OKD username
preferred_username not safe as per https://auth.docs.cern.ch/user-documentation/oidc/config/#what-will-be-in-your-tokens
GitLab jobs artifacts no longer stored forever as of Monday, November 4th 08:30h. Further information under https://cern.ch/otg0152576
preferred_username not safe as per https://auth.docs.cern.ch/user-documentation/oidc/config/#what-will-be-in-your-tokens