UFAL/The private information are released on the userRegistration and userMetadata endpoints

[milanmajchrak]

The original issue: ufal#1189

[Paurikova2]

Tests:

1. Anonymous: Forbidden access to the endpoint.
2. User: Allowed access to the endpoint for their own ID, but forbidden access for other IDs.
3. Administrator: Allowed access to the endpoint for any ID.