Notify Admin with alert when new User might generate overages

Angelo Gulinarequested to merge
ag/466654-notify-alert-for-sm-bso-user-service-new into master

What does this MR do and why?

Related to https://gitlab.com/gitlab-org/gitlab/-/issues/466654, with this MR we are:

  1. Preventing adding Users when the instance has reached its licensed user count
  2. Notifying the Admin that the above

Notes:

  1. the feature is behind the FF [wip] https://gitlab.com/gitlab-org/gitlab/-/issues/502157+.
  2. When User Cap is enabled, the User will be created regardless of licensed user count, and put into approving queue.

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Regular User Premium
no-more-seats
Regular User Ultimate
no-more-seats-ultimate
Auditor User in Premium
no-more-seats-auditor
Auditor User in Ultimate
no-more-seats-auditor-ultimate

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Edited by Angelo Gulina

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