feat(dev-infra): save invalid commit message attempts to be restored on next commit attempt (#38304)

When a commit message fails validation, rather than throwing out the commit message entirely
the commit message is saved into a draft file and restored on the next commit attempt.

PR Close #38304

dev-infra/commit-message/commit-message-draft.ts

@@ -0,0 +1,30 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import {existsSync, readFileSync, unlinkSync, writeFileSync} from 'fs';
+
+/** Load the commit message draft from the file system if it exists. */
+export function loadCommitMessageDraft(basePath: string) {
+  const commitMessageDraftPath = `${basePath}.ngDevSave`;
+  if (existsSync(commitMessageDraftPath)) {
+    return readFileSync(commitMessageDraftPath).toString();
+  }
+  return '';
+}
+
+/** Remove the commit message draft from the file system. */
+export function deleteCommitMessageDraft(basePath: string) {
+  const commitMessageDraftPath = `${basePath}.ngDevSave`;
+  if (existsSync(commitMessageDraftPath)) {
+    unlinkSync(commitMessageDraftPath);
+  }
+}
+
+/** Save the commit message draft to the file system for later retrieval. */
+export function saveCommitMessageDraft(basePath: string, commitMessage: string) {
+  writeFileSync(`${basePath}.ngDevSave`, commitMessage);
+}