[eslint-plugin-specs] fix npm lifecycle hook

[kelset]

Summary

In 0.70-stable we started seeing yarn run lint fail; turns out, this is happening because the latest release of @react-native/eslint-plugin-specs 0.0.4 (from ea8d8e2) is faulty: the underlying reason is that since 0.0.2 there was this local workaround in place 2d06e6a (that changes a flag from false to true) but in NPM 8 the lifecycle hook prepublish has been deprecated so this pre publishing script to change the flag was not run (you can easily verify by checking the node_module and see react-native-modules.js the flag on L17 is set to false).

This PR addresses it by moving to the new lifecycle hook prepack (and modifies the other files accordingly).

After this PR is merged, we'll need to cherry pick it into 0.70 and do both a new release from the 0.70 branch and one from the main branch to have new versions of this module with the flag set correctly.

Changelog

[General] [Fixed] - Fix eslint-plugin-specs prepack npm lifecycle hook now that we use npm 8

Test Plan

Go in the eslint-plugin-specs folder, run npm pack, unzip the generated tar file, go into package, verify that L17 of react-native-modules.js is correctly changed to const PACKAGE_USAGE = true; (instead of false - which is what happen without this fix).

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 743f9ff
Branch: main

[facebook-github-bot]

@dmitryrykun has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @kelset in 8441c4a.

^{When will my fix make it into a release? | Upcoming Releases}

[cortinico]

Thank you very much @kelset for investigating this and fixing this issue 🙏 We got affected by a similar issue in #34198

I've checked through the codebase and haven't found other occurrences of prepublish so we should be good to go for the future 👍