SIENTIAPDE-1325

Refactor initialization of Activities, Gates, and MongoDB classes for improved readability by using multi-line argument formatting. Update related tests to match the new initialization style.

scouter/activities/mongodb.py

@@ -60,7 +60,12 @@ class MongoDB(SientiaMonitoring):
             metrics_controller=metrics_controller,
         )
 
-        SientiaMonitoring.__init__(self, logger=logger, notification_handler=notification_handler, metrics_controller=metrics_controller)
+        SientiaMonitoring.__init__(
+            self,
+            logger=logger,
+            notification_handler=notification_handler,
+            metrics_controller=metrics_controller,
+        )
 
     def close(self):
         """