SIENTIAPDE-1712

Refactor imports in gates.py and mlflow.py for improved organization

- Removed unnecessary import statement in mlflow.py and re-added it in a more appropriate location.
- Cleaned up the workflow metadata assignment in gates.py for better readability.

laborious/activities/gates.py

@@ -479,7 +479,7 @@ class Gates(MinioManager):
             minio_repo=self.minio_repository,
             model_name=input_data['model_name'],
             operation='transform',
-            workflow_metadata=metadata,
+            workflow_metadata=metadata
         )
 
     @activity.defn(name='format_prediction')