Fix file tree search missing relative URL root

Stan Hurequested to merge
sh-file-tree-search-relative-url-root into master

What does this MR do and why?

Fixes the follow-up from !258829 (merged). The file tree search built its request URL as a root-relative path, so it returned a 404 on instances with a relative URL root. It now builds the URL from the projectPath() path helper, which already includes the relative URL root and the organization prefix. A Jest test covers the relative-root case.

References

How to set up and validate locally

  1. Serve GDK under a relative URL root, then restart:

    gdk config set relative_url_root /gitlab
gdk reconfigure
gdk restart

  2. Open any repository and open the file tree browser.

  3. Click the file search box and type a file name.

  4. The results should populate. Before this fix the request to /<group>/<project>/-/files/<ref> dropped the /gitlab prefix and returned a 404, so no results showed.

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