Check returned status codes in various integrations and cases

[patrick91]

in #1809 and #2266 I've changed the views to all have the same response codes for all cases, but I'm not 100% sure the status code make a lot of sense for all cases.

I think we can use this issue to discuss what the view should return on the various cases, for example when doing a GET to /graphql with graphiql disable return 404, but it returns 200 when sending a valid query and we allow queries via GET.

This should be done once we merge #1809

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[jkimbo]

We should follow the draft HTTP spec: https://github.com/graphql/graphql-over-http/blob/main/spec/GraphQLOverHTTP.md#status-codes