Update script to revoke actively used PATs

* In the first iteration of this class, the "cut off date" was used to
  revoke personal access tokens that were last used before that date.
* In that context, this was a class for revoking unused PATs.
* This MR makes it possible to run this class so that the "cut off date"
  is to revoke any tokens created before that date, irrespective of
  when they were last used. So it now works for both used and unused
  PATs.
* First MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/95340