fix: better wenxin rerank handler, close #11252

[yihong0618]

Summary

better wenxin error handler close #11252

test script here you can change the payload for the test....to check baidu error code design.....

import requests
import json

def get_access_token():
    """
    使用 API Key，Secret Key 获取access_token，替换下列示例中的应用API Key、应用Secret Key
    """
        
    url = "https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id=${clinet_id}&client_secret=${client_secret}"
    
    payload = json.dumps("")
    headers = {
        'Content-Type': 'application/json',
        'Accept': 'application/json'
    }
    response = requests.request("POST", url, headers=headers, data=payload)
    return response.json().get("access_token")

def main():
        
    url = "https://aip.baidubce.com/rpc/2.0/ai_custom/v1/wenxinworkshop/reranker/bce_reranker_base?access_token=" + get_access_token()
    
    payload = json.dumps({
        "query": " ",
        "documents":["上海气候", "北京美食"],
        "top_n": 1
    })
    headers = {
        'Content-Type': 'application/json'
    }
    
    response = requests.request("POST", url, headers=headers, data=payload)
    print(response.status_code, "!!!")
    print(response.json())
    
    print(response.text)
    

if __name__ == '__main__':
    main()

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• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[laipz8200]