Make use of http.HTTPStatus for response status code checks

[ulgens]

I got this idea from https://www.b-list.org/weblog/2023/dec/04/python-http-status-codes/ . I always liked DRF's status and I think it makes the code easier to read. Python's http version of the same thing is not looking nice as DRF's in my opinion (.HTTP_200_OK vs .OK), but still an improvement over using directly the numeric codes.

[kiendang]

We do have DRF as test dependency so we can use their status here. I agree that DRF's statuses look nicer and more dev-friendly too since sometimes we need to reference GraphQL specs and they mostly reference the status code directly.

[kiendang]

And if you want to use it in the main codebase we can alias Python's http statuses?