Broken resource_access_tokens page in admin/credentials inventory page on Self-Managed

What?

The group access token of a deleted user still exists. The grAT/prAT page on the credentials inventory has a column for the user who created their token. Since the user does not exist at that point, it breaks the page: /admin/credentials?filter=resource_access_tokens

Screenshots

Page

Current Behaviour

User deletion does not revoke their associated access tokens which triggers the nil error due to the resource_access_token.user.created_by user not existing.

Expected Behaviour

Implement a fallback or include access tokens during user deletion

Steps to Reproduce

1. Create a group access token
2. Delete the user you used to create the grAT
3. Wait for the user to be fully deleted by the ::DeleteUserWorker
4. Navigate to /admin -> credentials -> Project and group access tokens
5. See the nil name error