Add notification_type to notification table.

It seems like an oversight not to include the notification type in the notifcation.
When updating statistics a query to the template table is required to get the type, this update will mean that query does not have to happen.

tests/app/celery/test_tasks.py

@@ -46,6 +46,7 @@ def _notification_json(template, to, personalisation=None, job_id=None, row_numb
         "template": str(template.id),
         "template_version": template.version,
         "to": to,
+        "notification_type": template.template_type
     }
     if personalisation:
         notification.update({"personalisation": personalisation})

tests/app/conftest.py

@@ -351,7 +351,8 @@ def sample_notification(notify_db,
         'reference': reference,
         'created_at': created_at,
         'content_char_count': content_char_count,
-        'personalisation': personalisation
+        'personalisation': personalisation,
+        'notification_type': template.template_type
     }
     if job_row_number:
         data['job_row_number'] = job_row_number

tests/app/dao/test_notification_dao.py

@@ -976,6 +976,7 @@ def _notification_json(sample_template, job_id=None, id=None, status=None):
         'template_version': sample_template.version,
         'created_at': datetime.utcnow(),
         'content_char_count': 160,
+        'notification_type': sample_template.template_type
     }
     if job_id:
         data.update({'job_id': job_id})