RNGP - Make sure the newArchEnabled is set to true for all the libs (#53138)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/53138

Without this patch, library could break if the user removes the `newArchEnabled=`
property from the `gradle.properties` file.

With this patch instead we hardcode the property to true, so all the libraries can consume
it if they wish.

Changelog:
[Internal] [Changed] -

Reviewed By: cipolleschi

Differential Revision: D79805857

fbshipit-source-id: 88dda707a0d80ac79e96c955ded2ef0823f3d3ff