[0.78] Allow codegen to skip code generation of app-specific files in libraries

[cipolleschi]

Target Branch(es)

0.78

Link to commit or PR to be picked

facebook/react-native@98b8f17

Description

This commit adds an extra configuration for Codegen so that libraries can skip the generation of some app-specific files.

[react-native-bot]

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[cipolleschi]

✅ Picked