etcd_worker: fix missed watch events caused by progress notifications (#3848)#3867

Closed

ti-chi-bot wants to merge 1 commit intopingcap:release-5.2from ti-chi-bot:cherry-pick-3848-to-release-5.2

+151-6

Commits on Dec 14, 2021

This is an automated cherry-pick of pingcap#3848

liuzix
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ti-chi-bot
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