After set placement rule, store take more than 30min to transfer leader in two stores

## Bug Report

### What did you do?
1、deploy 3 zone cluster, each one has 2 stores.
2、Use br import 200G data.
3、Set placement that zone1/zone2 voter, zone3 follower.

### What did you expect to see?
After placement rules set succeeded, stores in zone3 should evict region leaders in a very short time.
### What did you see instead?

### What version of PD are you using (`pd-server -V`)?
/ # /pd-ctl -V
Release Version: v5.3.0
Edition: Community
Git Commit Hash: fe6fab9268d2d6fd34cd22edd1cf31a302e8dc5c
Git Branch: heads/refs/tags/v5.3.0
UTC Build Time: 2021-11-22 10:50:47

logs and monitor data can be get from minio by testbed testbed-oltp-hm-qhv25.