feat: support prechecking down peers before restarting tikv pod (#6877)#6882

ti-chi-bot[bot] merged 4 commits into

pingcap:release-2.1pingcap/tidb-operator:release-2.1from

ti-chi-bot:cherry-pick-6877-to-release-2.1ti-chi-bot/tidb-operator:cherry-pick-6877-to-release-2.1Copy head branch name to clipboard