`schema-kitchen-sink.graphql` contains spec-invalid GraphQL

We're ignoring it in `oxfmt` config for now, but we should update the test (and fix the parser, because it doesn't handle this properly).

For reference, this was corrected in `graphql-js`'s version of the test which this copied.
https://github.com/graphql/graphql-js/commit/74d5bf54d1e75b6ef224cb#diff-fd3ee0ca4f0deb83ed6f82e5e204b6a3b4677870e858d4f67538ca01c463bef8