Test checkout pull request in worktree

[alexr00]

Refs #8478

• anyOS
• anyOS

Complexity: 3

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Context

A new 'Checkout Pull Request in Worktree' option has been added to the Pull Requests view context menu and the PR Description view.

Test Steps

1. Install the latest pre-release of the GitHub Pull Requests extension enabled and open a folder that contains a clone of a GitHub repository and PRs
2. There are two entry points for checking out a PR in a worktree
   • The context menu of a PR in the Pull Requests view
   • The "Checkout" dropdown button in the PR description webview
3. Try both these entry points. Verify that they work as you'd expect, and that you can choose to open the worktree in the current window or a new window.