Use the new task wrapper methods rather than creating a task directly

app/notifications/notifications_ses_callback.py

@@ -13,7 +13,7 @@ from app.clients.email.aws_ses import get_aws_responses
 from app.dao import (
     notifications_dao
 )
-
+from app.celery.statistics_tasks import create_outcome_notification_statistic_tasks
 from app.notifications.process_client_response import validate_callback_data
 from app.notifications.utils import confirm_subscription
 
@@ -95,6 +95,9 @@ def process_ses_response():
                     datetime.utcnow(),
                     notification.sent_at
                 )
+
+            create_outcome_notification_statistic_tasks(notification)
+
             return jsonify(
                 result="success", message="SES callback succeeded"
             ), 200