Fixes on messaging and calendar (#7485)

Fix syncedAt no longer been set on message sync.
Fix calendar data model:
- Add `syncedAt` to `CalendarChannelWorkspaceEntity`
- Move `recurringEventExternalId` from `CalendarEventWorkspaceEntity` to
`CalendarChannelEventAssociationWorkspaceEntity` since the id is
relative to one channel
Fix save queries on calendar sync after regression.

packages/twenty-front/src/testing/mock-data/generated/mock-metadata-query-result.ts

@@ -9080,28 +9080,6 @@ export const mockedStandardObjectMetadataQueryResult: ObjectMetadataItemsQuery =
                     relationDefinition: null,
                   },
                 },
-                {
-                  __typename: 'fieldEdge',
-                  node: {
-                    __typename: 'field',
-                    settings: {},
-                    id: '567c7852-6dc5-4c6e-826d-e4b253614e60',
-                    type: 'TEXT',
-                    name: 'recurringEventExternalId',
-                    label: 'Recurring Event ID',
-                    description: 'Recurring Event ID',
-                    icon: 'IconHistory',
-                    isCustom: false,
-                    isActive: true,
-                    isSystem: false,
-                    isNullable: false,
-                    createdAt: '2024-09-25T13:45:32.757Z',
-                    updatedAt: '2024-09-25T13:45:32.757Z',
-                    defaultValue: "''",
-                    options: null,
-                    relationDefinition: null,
-                  },
-                },
                 {
                   __typename: 'fieldEdge',
                   node: {