Don't include archived projects when creating group milestones
What does this MR do?
It excludes archived projects from the New Group Milestone form
Are there points in the code the reviewer needs to double check?
Tests?
Why was this MR needed?
Before this change archived projects were included in the New Group Milestone form which doesn't really make sense as you are no longer working on those projects.
What are the relevant issue numbers?
Closes #19217 (closed)
Screenshots (if relevant)
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](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)