sink(ticdc): fix a bug that may cause data loss while closing Writer failed (#12437)#12440

ti-chi-bot wants to merge 2 commits intopingcap:release-7.1pingcap/tiflow:release-7.1from

ti-chi-bot:cherry-pick-12437-to-release-7.1ti-chi-bot/tiflow:cherry-pick-12437-to-release-7.1Copy head branch name to clipboard