Move some constants to common (#11004)

### What problem does this PR solve?

As title.

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

api/apps/connector_app.py

@@ -18,11 +18,11 @@ import time
 from flask import request
 from flask_login import login_required, current_user
 
-from api.db import TaskStatus, InputType
+from api.db import InputType
 from api.db.services.connector_service import ConnectorService, Connector2KbService, SyncLogsService
 from api.utils.api_utils import get_json_result, validate_request, get_data_error_result
 from common.misc_utils import get_uuid
-from common.constants import RetCode
+from common.constants import RetCode, TaskStatus
 
 @manager.route("/set", methods=["POST"])  # noqa: F821
 @login_required