do not require @fb-tools/babel-register in open source (#46863)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/46863

open source should not require `fb-tools/babel-register`

Changelog: [Internal]

Reviewed By: huntie

Differential Revision: D63976514

fbshipit-source-id: 83302adfc8059d294ca568f9edf1aa24d0244933