Add merge_requests_enabled field to namespace in GraphQL

Coung Ngorequested to merge
557074-cngo-add-merge_requests_enabled-to-graphql into master

What does this MR do and why?

Add merge_requests_enabled field to namespace in GraphQL (#557074 (closed))

This is so the frontend can know if merge requests are disabled and therefore do not show the "Create merge request" button on the issue page

Changelog: added

References

Screenshots or screen recordings

How to set up and validate locally

{
  namespace(fullPath: "no-merge-requests/no-merge-requests-project") {
    mergeRequestsEnabled
  }
}

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Related to #557074 (closed)

Edited by Coung Ngo

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