Move test & script utils out of /lib (#17517)

* Remove an unused file

* Move authenticate-to-aws to scripts/utils

* Move crowdin-config to tests/utils

* Remove add-frontmatter-to-file

* Move find-unused-assets

* Move git-utils to script/utils

* Move lib/github to script/utils

* Revert "Remove an unused file"

This reverts commit cd93ad846a0354e957359f23124eb0724c9147cf.

* Move find-extraneous-translation-files to script/utils

* We already have tests/helpers

* Rename script/utils => helpers for consistency

* Forgot a path

* Fix path to crowdin-config

Co-authored-by: Chiedo John <2156688+chiedo@users.noreply.github.com>

script/helpers/github.js

@@ -0,0 +1,18 @@
+if (!process.env.GITHUB_TOKEN) {
+  require('dotenv').config()
+}
+
+// this module needs to work in development, production, and GitHub Actions
+//
+// GITHUB_TOKEN comes from one of the following sources:
+// 1. set in the .env file (development)
+// 2. set as a Heroku config var (staging and production)
+// 3. an installation token granted via GitHub Actions
+const apiToken = process.env.GITHUB_TOKEN
+
+// See https://github.com/octokit/rest.js/issues/1207
+module.exports = function github () {
+  return require('@octokit/rest')({
+    auth: `token ${apiToken}`
+  })
+}