Fix the border radius on milestone cards when there are no items

Rinku Crequested to merge
gitlab-community/gitlab-org/gitlab:rc_fix_border_radius_on_milestone_page_issuable_cards into master

What does this MR do and why?

Fix the border radius on milestone cards when there are no items

Screenshots or screen recordings

Before After
Screenshot 2026-02-28 at 19.36.02.png Screenshot 2026-02-28 at 19.40.23.png

How to set up and validate locally

  1. Checkout this branch and run gdk locally
  2. Go to any project's milestone page and open a single milestone that has 0 work items or 0 items on any categories like Unstarted, Ongoing or Completed
  3. Notice the rounded border radius on card item header that has 0 items
  4. Compare to master branch where it wasn't rounded (Check screenshots for better clarity)

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