Add namespace ban and unban audit events

Jio Castillorequested to merge
603088-add-namespace-ban-audit-events into master

What does this MR do and why?

Add namespace ban and unban audit events to allow group owners to track when and who banned a user.

References

Screenshots or screen recordings

Before After

How to set up and validate locally

  1. Create a group
  2. Invite a user to the group
  3. Ban the user
  4. Unban the user
  5. Navigate to the group's audit events
  6. Observe entries for the actions above

MR acceptance checklist

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Related to #603088 (closed)

Edited by Jio Castillo

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