test: fix TestTaskError and TestMultiError flaky tests (#2779) #2817
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This is an automated cherry-pick of #2779
What problem does this PR solve?
close https://github.com/pingcap/ticdc/issues/2469
What is changed and how it works?
In one case, it did happen that isCancelled was used to the next event before it was updated, and ErrCh immediately received an error, just as cancel was called during the execution of AddEvent, which is why I encountered this unstable test. I was able to reproduce the problem occasionally after increasing the number of events and limiting resources locally.
Check List
Tests
Code changes
None
Side effects
None
Related changes
Release note