Refactor user ID handling in command handlers and update Protobuf package version to 0.0.124

src/FrontOffice.BFF.WebApi/Common/Behaviours/PerformanceBehaviour.cs

@@ -33,7 +33,7 @@ public class PerformanceBehaviour : Interceptor
         if (elapsedMilliseconds > 500)
         {
             var requestName = typeof(TRequest).Name;
-            var userId = _currentUserService.UserId ?? string.Empty;
+            var userId = _currentUserService.UserId;
 
             _logger.LogWarning("gRPC Long Running Request: {Name} ({ElapsedMilliseconds} milliseconds) {@UserId} {@Request}",
                 requestName, elapsedMilliseconds, userId, request);