etcd/client(ticdc): add retry operation for etcd transaction api (#4248) (#4474)#4528

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ti-chi-bot wants to merge 1 commit intopingcap:release-4.0from ti-chi-bot:cherry-pick-4474-to-release-4.0

+988-24

Commits on Feb 8, 2022

This is an automated cherry-pick of pingcap#4474

CharlesCheung96
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ti-chi-bot
committed