Add cleanup method for server stats on delete

app/classes/shared/main_controller.py

@@ -841,6 +841,7 @@ class Controller:
 
                 # Cleanup scheduled tasks
                 try:
+                    srv_obj.remove_stats_job()
                     HelpersManagement.delete_scheduled_task_by_server(server_id)
                 except DoesNotExist:
                     logger.info("No scheduled jobs exist. Continuing.")

app/classes/shared/server.py

@@ -504,6 +504,9 @@ class Server:
                     f"Assuming it was never started."
                 )
 
+    def remove_stats_job(self):
+        self.server_scheduler.remove_job("stats_" + str(self.server_id))
+
     def start_crash_detection(self):
         # This is only used if the crash detection settings change
         # while the server is running.