fix npm lifecycle hook (#34273)

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 https://github.com/facebook/react-native/commit/ea8d8e2f49ea3ce15faeab500b661a1cacacf8a8) is faulty: the underlying reason is that since 0.0.2 there was this local workaround in place https://github.com/facebook/react-native/commit/2d06e6a4c9261bb7790cf217b66145415301bc54 (that changes a flag from false to true) but in NPM 8 the lifecycle hook `prepublish` has [been deprecated](https://docs.npmjs.com/cli/v8/using-npm/scripts#life-cycle-scripts) 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

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

Pull Request resolved: https://github.com/facebook/react-native/pull/34273

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).

Reviewed By: GijsWeterings

Differential Revision: D38151433

Pulled By: dmitryrykun

fbshipit-source-id: 7c4f13dae70eb731d57cbafa90f7be05c9bb8576

packages/eslint-plugin-specs/package.json

@@ -9,7 +9,7 @@
     "directory": "packages/eslint-plugin-specs"
   },
   "scripts": {
-    "prepublish": "node prepublish.js"
+    "prepack": "node prepack.js"
   },
   "dependencies": {
     "@babel/core": "^7.14.0",

packages/eslint-plugin-specs/react-native-modules.js

@@ -13,7 +13,7 @@
 const path = require('path');
 const withBabelRegister = require('./with-babel-register');
 
-// We run yarn prepublish before publishing package which will set this value to true
+// We use the prepack hook before publishing package to set this value to true
 const PACKAGE_USAGE = false;
 const ERRORS = {
   misnamedHasteModule(hasteModuleName) {