statistics: delete cluster status metrics on store deletion (#9945)#10189

ti-chi-bot wants to merge 1 commit intotikv:release-8.1tikv/pd:release-8.1from

ti-chi-bot:cherry-pick-9945-to-release-8.1ti-chi-bot/pd:cherry-pick-9945-to-release-8.1Copy head branch name to clipboard