Show Only Remote Branches

### Describe the feature or problem you’d like to solve

I would like a feature that allows me to only see remote branches in my branch list drop down. It could be a line that divides local and remote, or a tab, or an option or check box to show only remotes.

### Proposed solution

This would allow users to more confidently choose the branch they want without accessing the remote in other ways (like through the web or git bash) to see which are on remote.

### Additional context

Different IDEs do this differently, but most have a way to divide or show only remotes. Visual Studio has one example that divides local and remote into separate tabs within the drop down:

I think a line dividing them in the drop down would be the most user friendly and least impactful to the current visual look - the same way "Recent branches" and "Other branches" are currently divided in GitHub Desktop.