POC timeline activity (#5697)

TODO: 
- remove WorkspaceIsNotAuditLogged decorators on activity/activityTarget
to log task/note creations
- handle attachments
-  fix css and remove unnecessary styled components or duplicates

packages/twenty-front/src/modules/object-metadata/utils/getObjectMetadataItemsMock.ts

@@ -3618,6 +3618,42 @@ export const getObjectMetadataItemsMock = () => {
         },
       ],
     },
+    {
+      __typename: 'object',
+      id: '20202020-049d-4d0c-9e7c-e74fee3f88b2',
+      dataSourceId: '20202020-7f63-47a9-b1b3-6c7290ca9fb1',
+      nameSingular: 'messageThread',
+      namePlural: 'messageThreads',
+      labelSingular: 'Message Thread',
+      labelPlural: 'Message Threads',
+      description: 'A webhook',
+      icon: 'IconMessage',
+      isCustom: false,
+      isRemote: false,
+      isActive: true,
+      isSystem: true,
+      createdAt: '2023-11-30T11:13:15.206Z',
+      updatedAt: '2023-11-30T11:13:15.206Z',
+      fields: [],
+    },
+    {
+      __typename: 'object',
+      id: '20202020-049d-4d0c-9e7c-e74fee3f88b2',
+      dataSourceId: '20202020-7f63-47a9-b1b3-6c7290ca9fb1',
+      nameSingular: 'timelineActivity',
+      namePlural: 'timelineActivities',
+      labelSingular: 'Timeline Activitiy',
+      labelPlural: 'Timeline Activities',
+      description: 'A webhook',
+      icon: 'IconIconTimelineEvent',
+      isCustom: false,
+      isRemote: false,
+      isActive: true,
+      isSystem: true,
+      createdAt: '2023-11-30T11:13:15.206Z',
+      updatedAt: '2023-11-30T11:13:15.206Z',
+      fields: [],
+    },
   ];
 
   // Todo fix typing here (the backend is not in sync with the frontend)