Commits view: Add a link to the Tree/Blob view of current path

Proposal

When viewing the commit history for a particular file or directory, like

• https://gitlab.com/gitlab-org/gitlab/-/commits/master/README.md, or
• https://gitlab.com/gitlab-org/gitlab/-/commits/master/app

there is no simple way to jump to the tree or blob view for that file or directory.

Clicking the links in the breadcrumbs at the top will load the Commits view for the selected path component.

It would be handy if there was a link in the Commits view pointing back to the tree view for the selected file/directory at the specified branch/ref.

That would complement the History button in the Tree view, which currently allows to quickly jump to the Commits view for a file or directory.

(For consistency with the Commit view, the link in the Commits view should probably be a "Browse files" button.)