feat(server): support comment notification type (#12924)

#### PR Dependency Tree


* **PR #12924** 👈
  * **PR #12925**

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Introduced comment and comment mention notifications, including email
notifications when users are mentioned or receive comments on documents.
* Added new email templates for comment and comment mention
notifications.
* Users can now control whether they receive comment-related emails via
a new user setting.

* **Bug Fixes**
  * None.

* **Documentation**
* Updated GraphQL schema documentation to reflect new notification types
and user settings.

* **Refactor**
* Streamlined and enhanced test coverage for notification and user
settings, including comment notifications.

* **Chores**
* Improved test setup and snapshot coverage for user settings and
notifications.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/mails/index.tsx

@@ -1,6 +1,6 @@
 import { render as rawRender } from '@react-email/components';
 
-import { Mention } from './docs';
+import { Comment, CommentMention, Mention } from './docs';
 import {
   TeamBecomeAdmin,
   TeamBecomeCollaborator,
@@ -125,6 +125,15 @@ export const Renderers = {
     Mention,
     props => `${props.user.email} mentioned you in ${props.doc.title}`
   ),
+  Comment: make(
+    Comment,
+    props => `${props.user.email} commented on ${props.doc.title}`
+  ),
+  CommentMention: make(
+    CommentMention,
+    props =>
+      `${props.user.email} mentioned you in a comment on ${props.doc.title}`
+  ),
   //#endregion
 
   //#region Team