[0.82] Ensure legacy architecture can't be initialized

[cortinico]

Target Branch

0.82

Link to commit or PR to be picked

facebook/react-native#53843

Description

This PR should be merged in 0.82 as it contains further runtime safeguards to prevent users from accidentally turning on legacy arch:

• [0.82] Ensure legacy architecture can't be initialized facebook/react-native#53843

Commits are:
facebook/react-native@eba38b8
facebook/react-native@d0d08e4
facebook/react-native@18cb4ed
facebook/react-native@23b2b99

Also cc @mdvacca and @rozele as I'm picking some of your commits

[react-native-bot]

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