Seeding Attachments, Disable ORM Logs, Seeding Parallelization (#15174)

Improvements to database seeding performance and developer experience.

**Changes:**

1. **Attachment seeding**: Add sample files (PDF, XLSX, PPTX, PNG, ZIP)
to dev seeds with proper file storage
2. **Seeding parallelization**: Process entities within batches in
parallel while respecting dependencies
3. **ORM query logging**: Replace manual logger toggling with
`ORM_QUERY_LOGGING` env var
- Values: `disabled` (default), `server-only` (for local dev), `always`
- Configured once in `core.datasource.ts`, removed from all seeder
services

**For .env:**
```bash
ORM_QUERY_LOGGING=server-only
```

Net result: Faster seeding, cleaner code (-68 lines), better local dev
experience.

packages/twenty-server/src/engine/workspace-manager/workspace-sync-metadata/workspace-sync-metadata.service.ts

@@ -61,6 +61,7 @@ export class WorkspaceSyncMetadataService {
   }> {
     let workspaceMigrations: WorkspaceMigrationEntity[] = [];
     const storage = new WorkspaceSyncStorage();
+
     const queryRunner = this.coreDataSource.createQueryRunner();
 
     this.logger.log('Syncing standard objects and fields metadata');