Iterate on personal access token audit log specs

The following discussion from !48094 (closed) should be addressed:

• @serenafang started a discussion:

  Creating a new MR to iterate on these specs a bit:

Previously, this spec file tested audit events when a user successfully created their own personal access token. This MR adds

• A test for when a non-admin user attempts to create a token for a different user
• A test for when an admin successfully creates a PAT for a different user
• A test for when an admin unsuccessfully creates a PAT for a different user