Expired pd address is used when update region-label/rules

[King-Dylan]

Bug Report

The drop database operation may fail after updated all pd addresses because the pd addresses in the region-rule (PDLabelManager.addrs ) were not updated in time.
Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

1.create new cluster
2.scale-out new pd member
3.scale-in all old pd member
4.drop database

2. What did you expect to see? (Required)

3. What did you see instead (Required)

MySQL > drop database test1;
ERROR 1105 (HY000): Patch "http://xxx.xxx.xxx:2879/pd/api/v1/config/region-label/rules": dial tcp xxx.xxx.xxx.xxx:2879: connect: connection refused

4. What is your TiDB version? (Required)

v5.4

[seiya-annie]

duplicated with #33908