Add MR badge for all branch

Description

This is part of a bigger effort to refactor the repository Commit list.

As part of this issue we should add MR badge to all branches.

🎨 Figma

Desktop

Screen Notes
All branches Proposal 2.3 Nondefault Branch Overflow Menu.jpg The View open merge request button in the old Commits page will be replaced by the open MRs badge implemented in #520125 (closed).
Edited by Chaoyue Zhao