Add copy permalink to repository overflow menu

What does this MR do and why?

This MR adds the new copy permalink item to the repository overflow menu. This feature currently only exists on blob page.

References

Please include cross links to any resources that are relevant to this MR. This will give reviewers and future readers helpful context to give an efficient review of the changes introduced.

• Component was added in !181901 (merged) (merged)
• This was previously attempted in !183897 (closed)
• The requirement of the path format has changed #452305 (comment 2386425348)
• We're now getting the path through graphql query added in !186829 (merged)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Desktop	Mobile

CleanShot 2025-04-24 at 13.38.11.mp4

Flow	Expected Url
At project overview	https://gdk.test:3443/gitlab-org/gitlab-shell/-/tree/5059017dea6e834f2f86fc670703ca36cbae98d6/
Inside a folder	https://gdk.test:3443/gitlab-org/gitlab-shell/-/tree/5059017dea6e834f2f86fc670703ca36cbae98d6/client
With branch	https://gdk.test:3443/gitlab-org/gitlab-shell/-/tree/a5a772442204b68dd38a0ab8611e24824962260f/client
With tag	https://gdk.test:3443/gitlab-org/gitlab-shell/-/tree/8b00540589eeeefc1774c92260286b7da1a112d1/client
With commit	https://gdk.test:3443/gitlab-org/gitlab-shell/-/tree/8b00540589eeeefc1774c92260286b7da1a112d1/cmd

How to set up and validate locally

1. Enable blob_repository_vue_header_app feature flag
2. Go to a directory
   • This should work when viewing with:
     1. A branch
     2. A commit (Code > Repository > Commits > Brows files (folder icon)
     3. A tag
   • Press y should work the same as clicking the dropdown item

Related to #452305 (closed)