Deprecate messageChannel messageFolder calendarChannel standard objects (#20836)

# Introduction

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

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

packages/twenty-front/src/modules/object-metadata/types/CoreObjectNamePlural.ts

@@ -4,14 +4,12 @@ export enum CoreObjectNamePlural {
   ApiKey = 'apiKeys',
   Attachment = 'attachments',
   Blocklist = 'blocklists',
-  CalendarChannel = 'calendarChannels',
   CalendarEvent = 'calendarEvents',
   Comment = 'comments',
   Company = 'companies',
   Dashboard = 'dashboards',
   TimelineActivity = 'timelineActivities',
   Message = 'messages',
-  MessageChannel = 'messageChannels',
   MessageParticipant = 'messageParticipants',
   MessageThread = 'messageThreads',
   Note = 'notes',