Make branch name globally copyiable

Problem to solve

I quite often need to switch to branch to the problem on any gitlab page, pipeline, job view, commit view.

It's very usually very difficult to copy branch name from gitlab these pages because making selection selects more than intended text.

In the merge request view the branch name has a "copy branch" widget. It would improve usability and provide consistency if any place where the branch name is displayed, is the "copy to clipboard" widget.

Places to add missing copy widget:

Edited by Elan Ruusamäe