Inconsistent Audit logging on purge

[davidradl]

In the repository handler

• removeEntity tries to delete then if delete is not supported issues a purge, the purge method issues an audit log
• There are 2 callers to purgeRelationship only one of which audit logs

This is inconsistent.
I suggest we move the relationship audit log to the purge method, which means that both callers will audit log.

[mandy-chessell]

To make this a good first issue, you need to add details of where this code is and how to test it. Also what should appear on the audit log - for example if purge is called from the API then you would want a different audit message to the case where purge is being used instead of delete.

[davidradl]

Thanks @mandy-chessell I will update after #5399 is complete -as it simplifies what we need to change

[planetf1]

(assigning for clarification)

[github-actions]

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