TestRaftClusterMultipleRestart is timeout

## Flaky Test

### Which jobs are failing
```
panic: test timed out after 5m0s
	running tests:
		TestRaftClusterMultipleRestart (5m0s)
```

### CI link
https://github.com/tikv/pd/actions/runs/11775311359/job/32795518792

### Reason for failure (if possible)


### Anything else
