Remove abilty to create deprecated non-expiring access tokens

We deprecated non-expiring access tokens and planned to remove its support in GitLab 16.0 for both Self-managed and GitLab.com. Users' non-expiring tokens will remain working for 1 year after that.

To make this deprecation complete, the GitLab system should prevent creating non-expiring access tokens. It should be done before or in %16.0. It is not a breaking change.