Resolve "Issue closed date does not show on issue list view"

What does this MR do?

Shows the closed date of an issue in the issue list using a tooltip.

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

I used a tooltip to show the closed_at of the issue. Same as how the updated_at is shown in an issue as seen in the screenshot below:

Why was this MR needed?

Proposal in #44671 (moved)

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Conforms to the code review guidelines
  • Has been reviewed by a UX Designer
  • Has been reviewed by a Frontend maintainer
  • Has been reviewed by a Backend maintainer
  • Has been reviewed by a Database specialist
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Closes #44671 (moved)