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/gates.py

@@ -37,7 +37,12 @@ class Gates(SientiaMonitoring):
     ensure data integrity and enable flexible data processing workflows.
     """
 
-    def __init__(self, logger: Logger, notification_handler: NotificationHandler, metrics_controller: MetricsController):
+    def __init__(
+        self,
+        logger: Logger,
+        notification_handler: NotificationHandler,
+        metrics_controller: MetricsController,
+    ):
         """
         Initialize the Gates class with logging and notification services.