Remove sync-metadata and IS_WORKSPACE_CREATION_V2_ENABLED feature flag (#16997)

# Introduction
Followup of
https://github.com/twentyhq/twenty/pull/17001#pullrequestreview-3638508738
close https://github.com/twentyhq/core-team-issues/issues/1910

We've completely decom the `sync-metadata` in production. We're now then
removing its implementation in favor of the v2.

## TODO:
- [x] Remove sync-metadata implem and commands
- [x] Remove workspace decorators 
- [x] Type each deprecated field to deprecated on their workspaceEntity
- [x] Remove the `workspace-sync-metadata` folder entirely
- [x] remove workspace migration
- [x] workspace migration removal migration
- [x] remove the `v2` references from workspace manager file names
- [x] remove the `v2` references from workspace manager modules
- [ ] Double check impact on translation file path updates


## Note
- Removed the gate logic
- Remains some service v2 naming, serverless needs to be migrated on v2
fully
- Removed workspaceMigration service app health consumption, making it
always returning up ( no more down ) cc @FelixMalfait ( quite obsolete
health check now, will require complete refactor once we introduce inter
app dependency etc )

packages/twenty-server/src/engine/core-modules/application/application-sync.module.ts

@@ -10,15 +10,15 @@ import { DatabaseEventTriggerModule } from 'src/engine/metadata-modules/database
 import { FieldMetadataModule } from 'src/engine/metadata-modules/field-metadata/field-metadata.module';
 import { WorkspaceManyOrAllFlatEntityMapsCacheModule } from 'src/engine/metadata-modules/flat-entity/services/workspace-many-or-all-flat-entity-maps-cache.module';
 import { ObjectMetadataModule } from 'src/engine/metadata-modules/object-metadata/object-metadata.module';
+import { ObjectPermissionModule } from 'src/engine/metadata-modules/object-permission/object-permission.module';
+import { PermissionFlagModule } from 'src/engine/metadata-modules/permission-flag/permission-flag.module';
 import { PermissionsModule } from 'src/engine/metadata-modules/permissions/permissions.module';
+import { RoleModule } from 'src/engine/metadata-modules/role/role.module';
 import { RouteTriggerModule } from 'src/engine/metadata-modules/route-trigger/route-trigger.module';
 import { ServerlessFunctionLayerModule } from 'src/engine/metadata-modules/serverless-function-layer/serverless-function-layer.module';
 import { ServerlessFunctionModule } from 'src/engine/metadata-modules/serverless-function/serverless-function.module';
-import { WorkspaceMigrationBuilderGraphqlApiExceptionInterceptor } from 'src/engine/workspace-manager/workspace-migration-v2/interceptors/workspace-migration-builder-graphql-api-exception.interceptor';
-import { WorkspaceMigrationV2Module } from 'src/engine/workspace-manager/workspace-migration-v2/workspace-migration-v2.module';
-import { ObjectPermissionModule } from 'src/engine/metadata-modules/object-permission/object-permission.module';
-import { PermissionFlagModule } from 'src/engine/metadata-modules/permission-flag/permission-flag.module';
-import { RoleModule } from 'src/engine/metadata-modules/role/role.module';
+import { WorkspaceMigrationBuilderGraphqlApiExceptionInterceptor } from 'src/engine/workspace-manager/workspace-migration/interceptors/workspace-migration-builder-graphql-api-exception.interceptor';
+import { WorkspaceMigrationModule } from 'src/engine/workspace-manager/workspace-migration/workspace-migration.module';
 import { WorkflowCommonModule } from 'src/modules/workflow/common/workflow-common.module';
 
 @Module({
@@ -34,7 +34,7 @@ import { WorkflowCommonModule } from 'src/modules/workflow/common/workflow-commo
     DatabaseEventTriggerModule,
     CronTriggerModule,
     RouteTriggerModule,
-    WorkspaceMigrationV2Module,
+    WorkspaceMigrationModule,
     PermissionsModule,
     RoleModule,
     ObjectPermissionModule,

packages/twenty-server/src/engine/core-modules/application/application-sync.service.ts

@@ -43,7 +43,7 @@ import { ServerlessFunctionLayerService } from 'src/engine/metadata-modules/serv
 import { ServerlessFunctionV2Service } from 'src/engine/metadata-modules/serverless-function/services/serverless-function-v2.service';
 import { FlatServerlessFunction } from 'src/engine/metadata-modules/serverless-function/types/flat-serverless-function.type';
 import { computeMetadataNameFromLabelOrThrow } from 'src/engine/metadata-modules/utils/compute-metadata-name-from-label-or-throw.util';
-import { WorkspaceMigrationValidateBuildAndRunService } from 'src/engine/workspace-manager/workspace-migration-v2/services/workspace-migration-validate-build-and-run-service';
+import { WorkspaceMigrationValidateBuildAndRunService } from 'src/engine/workspace-manager/workspace-migration/services/workspace-migration-validate-build-and-run-service';
 
 @Injectable()
 export class ApplicationSyncService {

packages/twenty-server/src/engine/core-modules/application/application.entity.ts

@@ -17,7 +17,7 @@ import { AgentEntity } from 'src/engine/metadata-modules/ai/ai-agent/entities/ag
 import { ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
 import { RoleDTO } from 'src/engine/metadata-modules/role/dtos/role.dto';
 import { ServerlessFunctionEntity } from 'src/engine/metadata-modules/serverless-function/serverless-function.entity';
-import { WorkspaceRelatedEntity } from 'src/engine/workspace-manager/workspace-sync/types/workspace-related-entity';
+import { WorkspaceRelatedEntity } from 'src/engine/workspace-manager/types/workspace-related-entity';
 
 @Entity({ name: 'application', schema: 'core' })
 @ObjectType('Application')

packages/twenty-server/src/engine/core-modules/application/application.resolver.ts

@@ -16,7 +16,7 @@ import { AuthWorkspace } from 'src/engine/decorators/auth/auth-workspace.decorat
 import { RequireFeatureFlag } from 'src/engine/guards/feature-flag.guard';
 import { SettingsPermissionGuard } from 'src/engine/guards/settings-permission.guard';
 import { WorkspaceAuthGuard } from 'src/engine/guards/workspace-auth.guard';
-import { WorkspaceMigrationBuilderGraphqlApiExceptionInterceptor } from 'src/engine/workspace-manager/workspace-migration-v2/interceptors/workspace-migration-builder-graphql-api-exception.interceptor';
+import { WorkspaceMigrationBuilderGraphqlApiExceptionInterceptor } from 'src/engine/workspace-manager/workspace-migration/interceptors/workspace-migration-builder-graphql-api-exception.interceptor';
 
 @UseGuards(
   WorkspaceAuthGuard,