Prevent auto reactivating a deactivated user when `User Cap` limit is reached

Proposal

A Deactivated user will go into Pending approval state upon sign-in when User Cap limit is reached.

Currently, Deactivated user will go into Active state upon sign-in even when User Cap limit is reached, thus billable users go beyond User Cap limit.

Reated epics

• [Self-managed] Give Admins control over acciden... (&4315 - closed)
• [Self-managed] Deactivation of dormant users (&5519 - closed)