Add forks breadcrumb

What does this MR do and why?

Adds breadcrumb to forks page

Screenshots or screen recordings

Before	After

How to set up and validate locally

Go to project forks (ie http://127.0.0.1:3000/gitlab-org/gitlab-test/-/forks)

✂️ UX Paper Cuts 16.7 → Project page (#430244 - closed)