Fixed private forks notice position in forks list

What does this MR do?

Moves the private forks notification item into the list on the forks page.

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

I haven't tested this with a large number of forks to see when the pagination gets involved but the DOM makes sense (hence the highlighting in the screenshot)

Why was this MR needed?

UX

What are the relevant issue numbers?

Closes #17671 (closed).

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together