(fix): Releasing old username

Ticket(s) / Related Merge Requests

Summary of Changes

Added missing functionality to release old username when admin updates user's username

Testing Considerations

Deployment Considerations

Regression Scope

Platform Affected (web, mobile, etc)

Developer Testing Completed

Screenshots / Screen Recording

Does this impact

• Localization
• Dark/light mode
• Guest mode

Definition of Done Checklist

• The Acceptance Criteria has been met
• Code is tested: Testing includes unit/spec, E2E/automated and manual testing
• Merge requests description has been filled out