Resolve "Tooltips scroll along the list within Pipeline jobs dropdown on MR widget"

What does this MR do?

contain Pipeline tooltips inside the dropdown

Are there points in the code the reviewer needs to double check?

• do we want this, or better to try insta-hiding them on scroll?
• For long pipeline names, I think this will always cause multiline tooltips with wrapped text

Why was this MR needed?

super annoying bug

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests added for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a UX Designer
  • Has been reviewed by a Frontend maintainer
• Conform by the style guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Closes #47516 (closed)