[dr-autosync]region can't be balance after scale out tikvs in primary datacenter in async mode
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Description
## Bug Report
### What did you do?
1. down 2 tikvs in 2 zone in the backup data center, and make the replication mode switch to async mode;
2. scale out 3 tikv for 3 zones in the primary data center;
### What did you expect to see?
New scaled out tikv should balance with existing tikvs in primary data center.
### What did you see instead?
### What version of PD are you using (`pd-server -V`)?
sh-4.2# /tiup/deploy/pd-2379/bin/pd-server -V
Release Version: v6.5.0-latest1025
Edition: Community
Git Commit Hash: e0ab17c4c684cdffd87b20d0d8486bbc81a60b1d
Git Branch: heads/refs/tags/v6.5.0-latest1025
UTC Build Time: 2023-10-25 05:05:51
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