DDL: use new PD API to get TiFlash replica table regionCount (#38571)#38732

Merged

ti-chi-bot merged 6 commits intopingcap:release-6.1from ti-chi-bot:cherry-pick-38571-to-release-6.1

Jan 9, 2023

+21-57

Commits on Oct 28, 2022

This is an automated cherry-pick of pingcap#38571

hehechen
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