Add mentions_issues to Merge Request API

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Problem to solve

Teams tracking issue references within Merge Requests have no programmatic way through the API to retrieve issues mentioned (but not closed by) a merge request.

Intended users

Developers

Further details

Adding an additional end-point shouldn't affect performance of other end-points, and the merge_request model already has the query built.

Proposal

Patch for lib/api/merge_requests.rb

478,489d477
<       get ':id/merge_requests/:merge_request_iid/mentions_issues' do
<         merge_request = find_merge_request_with_access(params[:merge_request_iid])
<         issues = ::Kaminari.paginate_array(merge_request.issues_mentioned_but_not_closing(current_user))
<         issues = paginate(issues)
< 
<         external_issues, internal_issues = issues.partition { |issue| issue.is_a?(ExternalIssue) }
< 
<         data = Entities::IssueBasic.represent(internal_issues, current_user: current_user)
<         data += Entities::ExternalIssue.represent(external_issues, current_user: current_user)
< 
<         data.as_json
<       end

Permissions and Security

No permission changes

Documentation

MR API documentation will need to be updated with new end-point.

Testing

Unknown

What does success look like, and how can we measure that?

Unknown

What is the type of buyer?

Unknown

Links / references