better support for git worktrees

[markgoho]

Now that Claude Code has native support for git worktrees, more people are using them. In an Nx project, when using worktrees, the entire repo is cloned to .claude/worktrees and results in many duplicate project.json files

The temporary solution is to add this path to the .nxignore file, but that has other implications.

We should consider how to better support duplicate Nx workspaces in subfolders