Clear user cache when deleting a service

The user JSON has a list of service IDs

app/notify_client/service_api_client.py

@@ -9,6 +9,7 @@ class ServiceAPIClient(NotifyAdminAPIClient):
     def __init__(self):
         super().__init__("a" * 73, "b")
 
+    @cache.delete('user', key_from_args=[4])
     def create_service(
         self,
         service_name,

tests/app/notify_client/test_service_api_client.py

@@ -58,12 +58,12 @@ def test_client_creates_service_with_correct_data(
     mocker.patch('app.notify_client.current_user', id='123')
 
     client.create_service(
-        service_name='My first service',
-        organisation_type='central_government',
-        message_limit=1,
-        restricted=True,
-        user_id=fake_uuid,
-        email_from='test@example.com',
+        'My first service',
+        'central_government',
+        1,
+        True,
+        fake_uuid,
+        'test@example.com',
     )
     mock_post.assert_called_once_with(
         '/service',

tests/app/notify_client/test_user_client.py

@@ -248,6 +248,7 @@ def test_returns_value_from_cache(
     (user_api_client, 'set_user_permissions', [user_id, SERVICE_ONE_ID, []], {}),
     (user_api_client, 'activate_user', [api_user_pending(fake_uuid())], {}),
     (service_api_client, 'remove_user_from_service', [SERVICE_ONE_ID, user_id], {}),
+    (service_api_client, 'create_service', ['', '', 0, False, user_id, fake_uuid()], {}),
     (invite_api_client, 'accept_invite', [SERVICE_ONE_ID, user_id], {}),
 ])
 def test_deletes_user_cache(