Make PATCH to change aup signature time working for client credentials

[rmiccoli]

AUDIT logs are now:

// Client credentials flow (note that client-cred is the client id)
2024-07-15 14:10:46.479  INFO 30339 --- [nio-8080-exec-2] AUDIT                                    : {"@type":"AupSignedOnBehalfEvent","timestamp":1721045446477,"category":"AUP","principal":"client-cred","message":"Client client-cred signed the AUP on behalf of test user","signature":{"aupId":1,"username":"test","signatureTime":"2024-07-15T14:10:46.476+02:00"},"source":"AupSignatureController"}
2024-07-15 14:11:56.215  INFO 30339 --- [io-8080-exec-10] AUDIT                                    : {"@type":"AupSignatureDeletedEvent","timestamp":1721045516214,"category":"AUP","principal":"client-cred","message":"Client client-cred deleted the AUP signature of test user","signature":{"aupId":1,"username":"test","signatureTime":"2024-07-15T14:10:46.476+02:00"},"source":"AupSignatureController"}

// Other flows linked to user identity
2024-07-15 14:13:08.435  INFO 30339 --- [nio-8080-exec-3] AUDIT                                    : {"@type":"AupSignedOnBehalfEvent","timestamp":1721045588435,"category":"AUP","principal":"admin","message":"User admin signed the AUP on behalf of test_102 user","signature":{"aupId":1,"username":"test_102","signatureTime":"2024-07-15T14:13:08.434+02:00"},"source":"AupSignatureController"}
2024-07-15 14:13:20.677  INFO 30339 --- [nio-8080-exec-4] AUDIT                                    : {"@type":"AupSignatureDeletedEvent","timestamp":1721045600677,"category":"AUP","principal":"admin","message":"User admin deleted the AUP signature of test_102 user","signature":{"aupId":1,"username":"test_102","signatureTime":"2024-07-15T14:13:08.434+02:00"},"source":"AupSignatureController"}

[enricovianello]

I know I'm just a bit annoying :)

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
96.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud