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/git-utils.js

@@ -0,0 +1,105 @@
+const github = require('./github')()
+
+// https://docs.github.com/rest/reference/git#get-a-reference
+async function getCommitSha (owner, repo, ref) {
+  try {
+    const { data } = await github.git.getRef({
+      owner,
+      repo,
+      ref
+    })
+    return data.object.sha
+  } catch (err) {
+    console.log('error getting tree')
+    throw (err)
+  }
+}
+
+// https://docs.github.com/rest/reference/git#list-matching-references
+async function listMatchingRefs (owner, repo, ref) {
+  try {
+    // if the ref is found, this returns an array of objects;
+    // if the ref is not found, this returns an empty array
+    const { data } = await github.git.listMatchingRefs({
+      owner,
+      repo,
+      ref
+    })
+    return data
+  } catch (err) {
+    console.log('error getting tree')
+    throw (err)
+  }
+}
+
+// https://docs.github.com/rest/reference/git#get-a-commit
+async function getTreeSha (owner, repo, commitSha) {
+  try {
+    const { data } = await github.git.getCommit({
+      owner,
+      repo,
+      commit_sha: commitSha
+    })
+    return data.tree.sha
+  } catch (err) {
+    console.log('error getting tree')
+    throw (err)
+  }
+}
+
+// https://docs.github.com/rest/reference/git#get-a-tree
+async function getTree (owner, repo, ref, allowedPaths = []) {
+  const commitSha = await getCommitSha(owner, repo, ref)
+  const treeSha = await getTreeSha(owner, repo, commitSha)
+  try {
+    const { data } = await github.git.getTree({
+      owner,
+      repo,
+      tree_sha: treeSha,
+      recursive: 1
+    })
+    // only return files that match the patterns in allowedPaths
+    // skip actions/changes files
+    return data.tree
+  } catch (err) {
+    console.log('error getting tree')
+    throw (err)
+  }
+}
+
+// https://docs.github.com/rest/reference/git#get-a-blob
+async function getContentsForBlob (owner, repo, blob) {
+  const { data } = await github.git.getBlob({
+    owner,
+    repo,
+    file_sha: blob.sha
+  })
+  // decode blob contents
+  return Buffer.from(data.content, 'base64')
+}
+
+// https://docs.github.com/rest/reference/repos#get-repository-content
+async function getContents (owner, repo, ref, path) {
+  try {
+    const { data } = await github.repos.getContents({
+      owner,
+      repo,
+      ref,
+      path
+    })
+    // decode contents
+    return Buffer.from(data.content, 'base64').toString()
+  } catch (err) {
+    console.log(`error getting ${path} from ${owner}/${repo} at ref ${ref}`)
+    throw (err)
+  }
+}
+
+module.exports = {
+  getTree,
+  getTreeSha,
+  getCommitSha,
+  getContentsForBlob,
+  getContents,
+  listMatchingRefs
+}