Fix group milestone path on issuable sidebar
What does this MR do?
Fix the milestone link in the issuable sidebar when an issue / MR has a group milestone assigned.
Are there points in the code the reviewer needs to double check?
milestone_url
isn't strictly needed here, but I will need it later anyway, and it's nice to have for consistency.
Why was this MR needed?
It fixes a regression!
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary - Tests
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Added for this feature/bug -
All builds are passing
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- Review
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Has been reviewed by Backend
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master
(if it does - rebase it please) -
Squashed related commits together
What are the relevant issue numbers?
https://gitlab.com/gitlab-org/gitlab-ce/issues/34778#note_36346483