added missing script in package.json (#52663)

Summary:
When switching between release/debug we're running a script to copy the correct xcframework. This script for the React-Core prebuilts was not part of the package.json file.

This caused the build to fail after trying to switch from debug -> release.

## Changelog:
[IOS] [FIXED] - Fixed missing script for resolving prebuilt xcframework when switching between release/debug

Pull Request resolved: https://github.com/facebook/react-native/pull/52663

Test Plan:
- Create new RN App
- Install pod with prebuilt deps and core
- Build (success)
- Switch to release
- Build (success)

Reviewed By: cortinico

Differential Revision: D78481302

Pulled By: cipolleschi

fbshipit-source-id: 1c7181e63219098ae140d77ff1cb2c0c9b9642e5