Save api key id when cancelling broadcast by API call

This is so that we can audit who cancelled the broadcast if
there are any issues.

tests/app/v2/broadcast/test_post_broadcast.py

@@ -7,6 +7,7 @@ from app.dao.broadcast_message_dao import (
     dao_get_broadcast_message_by_id_and_service_id,
 )
 from tests import create_service_authorization_header
+from tests.app.db import create_api_key
 
 from . import sample_cap_xml_documents
 
@@ -130,6 +131,7 @@ def test_valid_cancel_broadcast_request_calls_validate_and_update_broadcast_mess
     is_approved,
     expected_status
 ):
+    api_key = create_api_key(service=sample_broadcast_service)
     auth_header = create_service_authorization_header(service_id=sample_broadcast_service.id)
 
     # create a broadcast
@@ -158,7 +160,11 @@ def test_valid_cancel_broadcast_request_calls_validate_and_update_broadcast_mess
         headers=[('Content-Type', 'application/cap+xml'), auth_header],
     )
     assert response_for_cancel.status_code == 201
-    mock_update.assert_called_once_with(broadcast_message, expected_status, updating_user=None)
+    mock_update.assert_called_once_with(
+        broadcast_message,
+        expected_status,
+        api_key_id=api_key.id
+    )
 
 
 def test_cancel_request_does_not_cancel_broadcast_if_reference_does_not_match(