qps drop to zero and also influence the lag of pitr or cdc during injection pd leader io hang or io delay 500ms or 1s due to transfer etcd leader failed
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Description
## Bug Report
### What did you do?
1、run tpcc
2、inject pd leader io hang last for 5m
### What did you expect to see?
qps can recover within 2mins
### What did you see instead?
qps drop to zero during injection pd leader io hang
io delay 500ms
### What version of PD are you using (`pd-server -V`)?
./pd-server -V
Release Version: v8.1.0
Edition: Community
Git Commit Hash: fca469ca33eb5d8b5e0891b507c87709a00b0e81
Git Branch: HEAD
UTC Build Time: 2024-05-09 02:15:45
2024-05-17T01:42:48.440+0800
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