Remove the trial boolean qualification for ultimate trials

Doug Stullrequested to merge
500325-update-valid-namespace into master

What does this MR do and why?

Remove the trial boolean qualification for ultimate trials

  • replace with a plan check, similar to our eligibility check in Namespace.eligible_for_trial where we need to allow previous legacy trials to have another duo enterprise trial with ultimate and the trial boolean never gets set to false on downgrade.
  • see https://gitlab.com/gitlab-org/gitlab/-/issues/500325

Changelog: other EE: true

Related to #500325

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