[next gen on clould] pd oom during tikv scaling up
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Description
## Bug Report
### What did you do?
3 * pd-4C-16GB
6 * tikv-16C-64GB
keyspace1：3 * tidb-16C-64GB
1、br restore 1400GB data to keyspace1
2、run workload with 160 threads
3、scale up tikv to 32C-128GB
### What did you expect to see?
no oom
### What did you see instead?
1、two pd oom during tikv scaling up
2、pd leader cpu was nearly full before oom
### What version of PD are you using (`pd-server -V`)?
sh-5.1# ./pd-server -V
Release Version: v9.0.0-beta.2.pre-21-g071b864
Edition: Enterprise
Kernel Type: Next Generation
Git Commit Hash: 071b864ea68eef2fc1989c8591478cf2f15c4a65
Git Branch: HEAD
UTC Build Time: 2025-07-15 08:57:25
sh-5.1#
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