api: add closes_issues field to merge request API data
What does this MR do?
Exposes the list of issues closed by a merge request.
Are there points in the code the reviewer needs to double check?
No.
Why was this MR needed?
So that post-close workflows may be used with issues.
What are the relevant issue numbers?
Screenshots (if relevant)
N/A
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
-
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Conform by the style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together