executor: fix goroutine leak in querying slow log (#32757)#32779

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ti-srebot wants to merge 1 commit intopingcap:release-5.1from ti-srebot:release-5.1-62ec7468e738

+69-7

Commits on Mar 3, 2022

cherry pick pingcap#32757 to release-5.1

djshow832
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ti-srebot
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