EE Port (Resolve "UI: Move "default branch" setting under "repository" settings")

Paul Slaughterrequested to merge
ee-36048-move-default-branch-settings-under-repository into master

What does this MR do?

This is the EE port of gitlab-ce!21380.

  • Resolved EE conflicts in app/views/projects/settings/repository/show.html.haml

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