Show Draft MR status on a project page

What does this MR do and why?

Show Draft MR status on a project page

References

Feature issue: #419516

This issue was raised here: https://gitlab.com/gitlab-org/foundations/ux-paper-cuts/team-tasks/-/issues/43#note_2476579586

FF issue: #550387

UX Paper Cuts planning issue: #513103 (closed) #513105 (closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. In rails console or on http://gdk.test:3000/rails/features/ enable the feature flag show_merge_request_status_draft

   Feature.enable(:show_merge_request_status_draft)

2. Go to any open MR that you have
3. Make it draft via the quick command or a top right kebab button
4. Open this projects MR page, for example http://gdk.test:3000/flightjs/Flight/-/merge_requests

MR acceptance checklist

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