Packages `pnpm link`ed from outside the workspace trigger no watch events when changed

[andrewbranch]

Extension Version

main

VS Code Version

Insiders today

Operating system Version

macOS

Steps to reproduce

1. pnpm link in a local package from outside the workspace (I assume npm link repros this too)
2. Import something from the package
3. Delete or rename that import in another editor, then build

Issue

No watch change is fired, so not only do we not refresh diagnostics, you basically have to restart the server to pick up the change, since we have a cached view of the file. Deleting and re-adding the import isn't sufficient.

[sheetalkamat]

In strada for failed lookups from package directory we watch node_modules/package for links and otherwise "node_modules"

microsoft/TypeScript#58139