feat(api): Save output variables as draft variables in single stepping

api/services/workflow_service.py

@@ -1,12 +1,12 @@
 import json
 import logging
+import time
 from collections.abc import Callable, Generator, Sequence
 from datetime import UTC, datetime
 from inspect import isgenerator
 from typing import Any, Optional
 from uuid import uuid4
 
-import time
 from sqlalchemy import select
 from sqlalchemy.orm import Session
 
@@ -40,6 +40,7 @@ from models.workflow import (
 )
 from services.errors.app import IsDraftWorkflowError, WorkflowHashNotEqualError
 from services.workflow.workflow_converter import WorkflowConverter
+
 from .errors.workflow_service import DraftWorkflowDeletionError, WorkflowInUseError
 from .workflow_draft_variable_service import WorkflowDraftVariableService, should_save_output_variables_for_draft