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/engine/metadata-modules/metadata-engine.module.ts

@@ -5,6 +5,8 @@ import { AiAgentMonitorModule } from 'src/engine/metadata-modules/ai/ai-agent-mo
 import { AiAgentModule } from 'src/engine/metadata-modules/ai/ai-agent/ai-agent.module';
 import { AiChatModule } from 'src/engine/metadata-modules/ai/ai-chat/ai-chat.module';
 import { AiGenerateTextModule } from 'src/engine/metadata-modules/ai/ai-generate-text/ai-generate-text.module';
+import { CalendarChannelMetadataModule } from 'src/engine/metadata-modules/calendar-channel/calendar-channel-metadata.module';
+import { ConnectedAccountMetadataModule } from 'src/engine/metadata-modules/connected-account/connected-account-metadata.module';
 import { CommandMenuItemModule } from 'src/engine/metadata-modules/command-menu-item/command-menu-item.module';
 import { DataSourceModule } from 'src/engine/metadata-modules/data-source/data-source.module';
 import { FieldMetadataModule } from 'src/engine/metadata-modules/field-metadata/field-metadata.module';
@@ -12,6 +14,8 @@ import { FlatEntityMapsGraphqlApiExceptionFilter } from 'src/engine/metadata-mod
 import { FrontComponentModule } from 'src/engine/metadata-modules/front-component/front-component.module';
 import { LogicFunctionLayerModule } from 'src/engine/metadata-modules/logic-function-layer/logic-function-layer.module';
 import { LogicFunctionModule } from 'src/engine/metadata-modules/logic-function/logic-function.module';
+import { MessageChannelMetadataModule } from 'src/engine/metadata-modules/message-channel/message-channel-metadata.module';
+import { MessageFolderMetadataModule } from 'src/engine/metadata-modules/message-folder/message-folder-metadata.module';
 import { NavigationMenuItemModule } from 'src/engine/metadata-modules/navigation-menu-item/navigation-menu-item.module';
 import { ObjectMetadataModule } from 'src/engine/metadata-modules/object-metadata/object-metadata.module';
 import { PermissionsModule } from 'src/engine/metadata-modules/permissions/permissions.module';
@@ -47,6 +51,10 @@ import { WorkspaceMetadataVersionModule } from 'src/engine/metadata-modules/work
     PermissionsModule,
     RouteTriggerModule,
     WebhookModule,
+    ConnectedAccountMetadataModule,
+    MessageChannelMetadataModule,
+    CalendarChannelMetadataModule,
+    MessageFolderMetadataModule,
   ],
   providers: [
     {
@@ -71,6 +79,10 @@ import { WorkspaceMetadataVersionModule } from 'src/engine/metadata-modules/work
     RoleModule,
     PermissionsModule,
     WebhookModule,
+    ConnectedAccountMetadataModule,
+    MessageChannelMetadataModule,
+    CalendarChannelMetadataModule,
+    MessageFolderMetadataModule,
   ],
 })
 export class MetadataEngineModule {}