Disable fork button on project limit

What does this MR do?

Disable for button on project page if user has reached project limit.

Screenshots (if relevant)

Same as on gif from issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/25164#note_19387273

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [-] Documentation created/updated
• [-] API support added
• 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 #25164 (closed)