qps is continuously affected during the simulated pd log disk io delay 1s which last for 10mins

## Bug Report

### What did you do?
1、run workload
2、simulated pd log disk io delay 1s which last for 10mins

### What did you expect to see?
no effort on workload

### What did you see instead?
qps is continuously affected during the simulated pd log disk io delay 1s which last for 10mins

### What version of PD are you using (`pd-server -V`)?

./pd-server -V
Release Version: v8.5.4
Edition: Community
Git Commit Hash: b448fca08722ffcafde9e15bf0594425c6930f14
Git Branch: HEAD
UTC Build Time: 2025-09-23 03:08:08
2025-10-03T17:38:00.715+0800 INFO k8s/client.go:141 it should be noted that a long-running command will not be interrupted even the use case has ended. For more information, please refer to https://github.com/pingcap/test-infra/discussions/129