Nested git worktrees show up as Uncommitted Changes

[XavierChanth]

Describe the Bug
When you create a git worktree, it shows up as an uncommitted change.

Steps to Reproduce
Steps to reproduce the behaviour:

1. Open a repo in vscode
2. Checkout branchA
3. Create a nested worktree for branchB - git worktree add .wt/worktreeB branchB

Expected Behaviour
Git Graph should locate worktrees and ignore them as changes.

Environment

• Git Graph Extension Version: 1.30.0
• Visual Studio Code Version: 1.84.1
• Operating System: macOS arm64

Screenshots (optional)

Additional Context (optional)
You could read from .git/worktrees/*/gitdir and drop the last path segment.
(I can't think of a better way to do this)

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