Added alert when job.notification_count doesn't match total notification for job

- Added log for when a job starts so that we will know when the processing of a job starts with the number of notifications
- Added dao method to get total notifications for a job id
- Added a test to check whether the number of notifications in the table matches the job notification_count

app/dao/notifications_dao.py

@@ -442,6 +442,16 @@ def get_total_sent_notifications_in_date_range(start_date, end_date, notificatio
     return result or 0
 
 
+def dao_get_total_notifications_for_job_id(job_id):
+    result = db.session.query(
+        func.count(Notification.id).label('count')
+    ).filter(
+        Notification.job_id == job_id
+    ).scalar()
+
+    return result or 0
+
+
 def is_delivery_slow_for_provider(
     sent_at,
     provider,