Test detecting past PR branches

[alexr00]

Refs: #1070

• anyOS @jo-oikawa
• anyOS @bpasero

Complexity: 3

Create Issue

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• Uninstall the GitHub Pull Request extension
• Make a new clone of a GitHub repo
• Open that clone in VS Code
• Go to GitHub.com, and find a couple PR branches in that repo that you've never checked out before
• Checkout those branches via the command line or via the built in Git extension
• Checkout your default branch
• Install the latest pre-release version of GitHub Pull Requests
• Verify that you see the PRs you checked out in the "Local Pull Request Branches" section of the Pull Requests view.

[jo-oikawa]

Works for me!