[0.85] Update generate-artifacts-executor scripts to skip write/cp for unchanged outputs

[chrfalch]

Target Branch

0.85

Link to commit or PR to be picked

facebook/react-native#55532

Description

This one was merged the day before 0.85.rc0 went out - should be part of 0.85 for Expo SDK-56 at least.

[github-actions]

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[alanleedev]

@react-native-bot merge 7516d747e4704eb6d3e02cfb54df6991da6c18c3 0.85-stable

[react-native-bot]

✅ Successfully picked up your commit facebook/react-native@7516d74 on the branch https://github.com/facebook/react-native/commits/0.85-stable