Turbopack: Allow fully dynamic import() in node_modules (#79153)
## What?
Allows e.g. ```import(`${url}`)``` when in node_modules. This makes
monaco-editor work automatically when it's correctly imported in e.g. a
`useEffect`.
- [x] Apply change
- [x] Verify against local reproduction
- [x] Add test case
Fixes #72613
Fixes PACK-4602