fix(server): add user id to comment-attachment model (#13113)

close AF-2723



#### PR Dependency Tree


* **PR #13113** 👈

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**
* Comment attachments now track and display the user who uploaded them.

* **Tests**
* Updated tests to verify that the uploader’s information is correctly
stored and retrieved with comment attachments.

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

packages/backend/server/src/models/comment-attachment.ts

@@ -32,6 +32,7 @@ export class CommentAttachmentModel extends BaseModel {
         name: input.name,
         mime: input.mime,
         size: input.size,
+        createdBy: input.createdBy,
       },
     });
   }