tests: fix more events could be sent after a table is removed (#2569) #2578
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This is an automated cherry-pick of #2569
What problem does this PR solve?
Close #2500
The test failure is caused by sending more row changed events to backend sink when a table sink is removed, the close channel way can't terminate table sink at once.
What is changed and how it works?
Use the context to control table sink lifecycle.
Check List
Tests
Release note