Remove JSC related files from the repo (#51945)

Summary:
Pull Request resolved: #51945

Remove code from jsc folder from React Native

## Changelog:
[iOS][Removed] - Remove code from jsc folder from React Native

Reviewed By: rshest

Differential Revision: D76419587

fbshipit-source-id: 6d5079c8f2843872172620601629e9643c7debdc

Author: cipolleschi