Prevent dropdown from closing when user clicks in a build.

What does this MR do?

Prevents dropdown from closing when the user clicks on a build, in the mini pipeline graph used in the MR widget: - will also be used in Commit View #28494 (closed).

This already happens in the mini pipeline graph in the pipelines' tables. This MR aims to make UX equal - and it uses the same technical solution.

Screenshot

Does this MR meet the acceptance criteria?

• Tests
  • Added for this feature/bug
  • All builds are passing
• 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 #24166 (closed)