WIP: Add upcoming and started milestone filters to issuable
What does this MR do?
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Screenshots (if relevant)
Todos
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Add specs -
Add upcoming and started milestone filters to issuable right sidebar
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
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 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?
Closes #30326 (moved)