Rather than relying on a preinstall script, set `engine-strict` to `true` in a
project `.npmrc` file, relying on the `engines` having `npm` set to note that
yarn should be used instead.

---

Output from `npm install` changes from:
```
$ npm install

> angular-srcs@12.0.0-next.7 preinstall /usr/local/account/js/angular
> node tools/yarn/check-yarn.js

/usr/local/account/js/angular/tools/yarn/check-yarn.js:12
  throw new Error(
  ^

Error: Please use Yarn instead of NPM to install dependencies. See: https://yarnpkg.com/lang/en/docs/install/
    at Object.<anonymous> (/usr/local/account/js/angular/tools/yarn/check-yarn.js:12:9)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs...