### Description
User creation was not properly logged within the action log, neither
from sub-user invite or manual user creation. This PR adds the relevant
log and includes testing.
### Manual testing scenarios
1. Invite a user within any created server
2. Create a user in the admin
3. Verify both users appear as an action in the action log
### Questions or comments
AI was used for secondary testing, QA and code review. No code was
written by AI.
### Resolved issues:
1. [x] resolvespterodactyl/panel#5631
