workload report “failed Error 8249: Unknown resource group 'default‘” when inject network partition between one of tidb and pd leader

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)
1、config
"tikv": "[pd]\nenable-forwarding = true",
"tidb": "enable-forwarding = true",
2、run tpcc
3、inject network partition between one of tidb and pd leader last for 10m

### 2. What did you expect to see? (Required)
workload shoud not report “failed Error 8249: Unknown resource group 'default‘”

### 3. What did you see instead (Required)
workload report “failed Error 8249: Unknown resource group 'default‘” when inject network partition between one of tidb and pd leader

### 4. What is your TiDB version? (Required)
./tidb-server -V
Release Version: v7.3.0-alpha
Edition: Community
Git Commit Hash: cac0db28813c1795cef3863fdd219350e5cf0bcd
Git Branch: heads/refs/tags/v7.3.0-alpha
UTC Build Time: 2023-07-10 11:11:37
GoVersion: go1.20.5
Race Enabled: false
Check Table Before Drop: false
Store: unistore
2023-07-11T10:58:27.999+0800