feat: migrate ConnectedAccount infrastructure entities to metadata schema (#18784)

## Summary

- Migrates 4 entities (`connectedAccount`, `messageChannel`,
`calendarChannel`, `messageFolder`) from per-workspace schemas to the
shared `core` metadata schema
- Introduces a `IS_CONNECTED_ACCOUNT_MIGRATED` feature flag to control
the migration: when enabled, reads come from core metadata and all
writes are dual-written to both workspace and core
- Extracts 12 enums from workspace entity files to `twenty-shared` for
reuse across frontend and backend
- Creates new TypeORM entities, metadata services, GraphQL
resolvers/DTOs, and exception interceptors per entity
- Each entity owns its own data access module
(`ConnectedAccountDataAccessModule`, `MessageChannelDataAccessModule`,
`CalendarChannelDataAccessModule`, `MessageFolderDataAccessModule`) — no
umbrella infrastructure module
- Adds a 1.20 upgrade command that backfills data from workspace schemas
to core (preserving UUIDs) and enables the feature flag
- Replaces direct repository access with data access service calls
across ~50 files in messaging, calendar, and connected-account modules
- Adds `lastSignedInAt` and `oidcTokenClaims` fields to the new
`ConnectedAccountEntity`
- Drops unused `lastSyncHistoryId` field from the migrated connected
account entity

## Test plan

- [x] Lint passes (`npx nx lint:diff-with-main twenty-server`)
- [x] Typecheck passes (`npx nx typecheck twenty-server`)
- [x] All unit tests pass (477 suites, 4267 tests, 0 failures)
- [ ] Manual test: verify messaging sync works with feature flag
disabled (existing behavior)
- [ ] Manual test: run upgrade command on a workspace, verify data
backfilled to core tables
- [ ] Manual test: verify messaging/calendar sync works with feature
flag enabled (dual-write path)
- [ ] Manual test: verify GraphQL metadata resolvers return correct data
when flag enabled

packages/twenty-server/src/modules/calendar/common/standard-objects/calendar-channel.workspace-entity.ts

@@ -1,6 +1,12 @@
 import { registerEnumType } from '@nestjs/graphql';
 
-import { FieldMetadataType } from 'twenty-shared/types';
+import {
+  CalendarChannelContactAutoCreationPolicy,
+  CalendarChannelSyncStage,
+  CalendarChannelSyncStatus,
+  CalendarChannelVisibility,
+  FieldMetadataType,
+} from 'twenty-shared/types';
 
 import { BaseWorkspaceEntity } from 'src/engine/twenty-orm/base.workspace-entity';
 import { type FieldTypeAndNameMetadata } from 'src/engine/workspace-manager/utils/get-ts-vector-column-expression.util';
@@ -8,36 +14,12 @@ import { type EntityRelation } from 'src/engine/workspace-manager/workspace-migr
 import { type CalendarChannelEventAssociationWorkspaceEntity } from 'src/modules/calendar/common/standard-objects/calendar-channel-event-association.workspace-entity';
 import { type ConnectedAccountWorkspaceEntity } from 'src/modules/connected-account/standard-objects/connected-account.workspace-entity';
 
-export enum CalendarChannelVisibility {
-  METADATA = 'METADATA',
-  SHARE_EVERYTHING = 'SHARE_EVERYTHING',
-}
-
-export enum CalendarChannelSyncStatus {
-  NOT_SYNCED = 'NOT_SYNCED',
-  ONGOING = 'ONGOING',
-  ACTIVE = 'ACTIVE',
-  FAILED_INSUFFICIENT_PERMISSIONS = 'FAILED_INSUFFICIENT_PERMISSIONS',
-  FAILED_UNKNOWN = 'FAILED_UNKNOWN',
-}
-
-export enum CalendarChannelSyncStage {
-  PENDING_CONFIGURATION = 'PENDING_CONFIGURATION',
-  CALENDAR_EVENT_LIST_FETCH_PENDING = 'CALENDAR_EVENT_LIST_FETCH_PENDING',
-  CALENDAR_EVENT_LIST_FETCH_SCHEDULED = 'CALENDAR_EVENT_LIST_FETCH_SCHEDULED',
-  CALENDAR_EVENT_LIST_FETCH_ONGOING = 'CALENDAR_EVENT_LIST_FETCH_ONGOING',
-  CALENDAR_EVENTS_IMPORT_PENDING = 'CALENDAR_EVENTS_IMPORT_PENDING',
-  CALENDAR_EVENTS_IMPORT_SCHEDULED = 'CALENDAR_EVENTS_IMPORT_SCHEDULED',
-  CALENDAR_EVENTS_IMPORT_ONGOING = 'CALENDAR_EVENTS_IMPORT_ONGOING',
-  FAILED = 'FAILED',
-}
-
-export enum CalendarChannelContactAutoCreationPolicy {
-  AS_PARTICIPANT_AND_ORGANIZER = 'AS_PARTICIPANT_AND_ORGANIZER',
-  AS_PARTICIPANT = 'AS_PARTICIPANT',
-  AS_ORGANIZER = 'AS_ORGANIZER',
-  NONE = 'NONE',
-}
+export {
+  CalendarChannelContactAutoCreationPolicy,
+  CalendarChannelSyncStage,
+  CalendarChannelSyncStatus,
+  CalendarChannelVisibility,
+};
 
 registerEnumType(CalendarChannelVisibility, {
   name: 'CalendarChannelVisibility',