feat(server): add immich.users.total metric (#21780)

* Add immich.users.total metric

* Fix tests & one lint error

* Lint

* Fix SQL Schema checks

* Fix nit

* Use workers argument in OnEvent hook and remove condition from method body

server/src/services/base.service.ts

@@ -215,6 +215,7 @@ export class BaseService {
       payload.storageLabel = sanitize(payload.storageLabel.replaceAll('.', ''));
     }
 
+    this.telemetryRepository.api.addToGauge(`immich.users.total`, 1);
     return this.userRepository.create(payload);
   }
 }