Continue wait for GraphQL responses with http status code 500.

Describe the bug Continue wait error for GraphQL responses with http status code 500.

To Reproduce Steps to reproduce the behavior:

1. Make a graphql query which would take more than 5 seconds (or reduce continueWait time configuration).

Expected behavior Though, we don't have this documented for graphql. for rest api it is documented to return with 200. Can we please have same http status code for graphql also. https://cube.dev/docs/http-api/rest/#prerequisites-continue-wait

Additional context From Slack thread- https://cube-js.slack.com/archives/C04NYBJP7RQ/p1684846190185819

@vasilev-alex