Resolve "Jump to top in merge request"

What does this MR do?

While scrolling down on a merge request page, this will allow users to scroll back to the top of whichever tab they are on by clicking on that specific tab.

What are the relevant issue numbers?

Closes #52276 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.