Our extension packaging backend creates a symlink for `.npm-workspaces`, but the implementation managing it had a bug in cases where we're potentially doing things multiple times. In our case, the Power Pack gets built repeatedly for different Python versions. After the first build, we clean up the tree, leaving the workspaces link dangling. In this case, the call to `.exists()` returns `False`, but the symlink is still there, and we'll fail when attempting to create it again. The fix is to check first if it's a symlink and unlink, and then otherwise check if there's something present which is not a symlink. Testing Done: Did a test build of an extension.