test(vdb/huaweicloudvectordb): Fix the wrong import path (#19413)

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/tests/integration_tests/vdb/__mock/huaweicloudvectordb.py

 
 import pytest
 from _pytest.monkeypatch import MonkeyPatch
-from api.core.rag.datasource.vdb.field import Field
 from elasticsearch import Elasticsearch
 
+from core.rag.datasource.vdb.field import Field
+
 
 class MockIndicesClient:
     def __init__(self):