Large Branch name breaks UI in the settings page

Summary

Large Branch name breaks UI in the settings page

Steps to reproduce

1. Open https://gitlab.com/testpilot/long-branch-names/settings/repository (if Admin)
2. Select Dropdown in Default Branch
3. Select Dropdown in Protected Branches (Expected)
4. Both dropdowns will look different

Example Project

https://gitlab.com/testpilot/long-branch-names

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com