Use minimal replacement class for MessageModel

ts/test-electron/services/AttachmentDownloadManager_test.ts

@@ -22,6 +22,7 @@ import { type AttachmentType, AttachmentVariant } from '../../types/Attachment';
 import { strictAssert } from '../../util/assert';
 import { AttachmentDownloadSource } from '../../sql/Interface';
 import { getAttachmentCiphertextLength } from '../../AttachmentCrypto';
+import { postSaveUpdates } from '../../util/cleanup';
 
 function composeJob({
   messageId,
@@ -119,6 +120,7 @@ describe('AttachmentDownloadManager/JobManager', () => {
       {
         ourAci: 'ourAci' as AciString,
         forceSave: true,
+        postSaveUpdates,
       }
     );
     await downloadManager?.addJob({