metrics: add circuit breaker metrics (#59338)#64972

ti-chi-bot[bot] merged 3 commits intopingcap:release-8.5pingcap/tidb:release-8.5from

ti-chi-bot:cherry-pick-59338-to-release-8.5ti-chi-bot/tidb:cherry-pick-59338-to-release-8.5Copy head branch name to clipboard