[0.81] Add missing `replace-rncore-version.js` script in package.json

[cipolleschi]

Target Branch

0.81

Link to commit or PR to be picked

react/react-native@2e55241

Description

For iOS prebuilds, we need to switch between debug and release based on what the user decides in Xcode.
We have a script to do so, but the script is currently not published on NPM (we forgot to add it)

[react-native-bot]

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[motiz88]

@react-native-bot merge 2e55241a901b4cd95917de68ce9078928820a208 0.81-stable

[react-native-bot]

✅ Successfully picked up your commit react/react-native@2e55241 on the branch https://github.com/facebook/react-native/commits/0.81-stable