Summary:
Fixes https://github.com/facebook/flipper/issues/1481
## Changelog
Fix symlinked scoped module resolving to outer directory
Pull Request resolved: https://github.com/facebook/flipper/pull/1482
Test Plan:
Added one more case to the existing test case for `getWatchFolders.ts`
```
❯ yarn run test:debug getWatchFolders
yarn run v1.22.4
$ yarn build:pkg && node --inspect node_modules/.bin/jest --runInBand getWatchFolders
$ cd pkg && yarn build
$ tsc -b
Debugger listening on ws://127.0.0.1:9229/41e16e0b-8a44-42fe-93ac-9dd9d06e418d
For help, see: https://nodejs.org/en/docs/inspector
PASS pkg-lib/src/__tests__/getWatchFolders.node.ts
getWatchFolders
✓ getWatchFolders correctly resolves symlinked packages (12 ms)
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 1 passed, 1 total
Time: 2.358 s
Ran all test suites matching /getWatchFolders/i.
{emoji:2728} Done in 8.60s.
```
Reviewed By: mweststrate
Differential Revision: D23293357
Pulled By: nikoant
fbshipit-source-id: de2a506693727489238c6f6ec62d07526f8f0c69
573bf8a940