Deprecate messageChannel messageFolder calendarChannel standard objects (#20836)

# Introduction

Removing old standard objects `messageChannel` and `messageFolder` and
`calendarChannel`

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/twenty-server/src/engine/metadata-modules/message-folder/entities/message-folder.entity.ts

@@ -1,3 +1,5 @@
+import { registerEnumType } from '@nestjs/graphql';
+
 import {
   Column,
   CreateDateColumn,
@@ -14,6 +16,10 @@ import { MessageFolderPendingSyncAction } from 'twenty-shared/types';
 import { MessageChannelEntity } from 'src/engine/metadata-modules/message-channel/entities/message-channel.entity';
 import { WorkspaceRelatedEntity } from 'src/engine/workspace-manager/types/workspace-related-entity';
 
+registerEnumType(MessageFolderPendingSyncAction, {
+  name: 'MessageFolderPendingSyncAction',
+});
+
 @Entity({ name: 'messageFolder', schema: 'core' })
 export class MessageFolderEntity extends WorkspaceRelatedEntity {
   @PrimaryGeneratedColumn('uuid')