executor: fix the panic that send on closed channel in the TestRandomFail

[xzhangxian1008]

What problem does this PR solve?

Issue Number: close #52069

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

Hi @xzhangxian1008. Thanks for your PR.

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[hawkingrei]

/check-issue-triage-complete

[hawkingrei]

/ok-to-test

[codecov]

Codecov Report

Merging #52076 (2b37565) into master (411e945) will decrease coverage by 17.7547%.
Report is 1 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #52076         +/-   ##
=================================================
- Coverage   72.3891%   54.6344%   -17.7547%     
=================================================
  Files          1481       1592        +111     
  Lines        365349     608874     +243525     
=================================================
+ Hits         264473     332655      +68182     
- Misses        81313     253056     +171743     
- Partials      19563      23163       +3600     

Flag	Coverage Δ
integration	36.5840% <100.0000%> (?)
unit	70.4255% <100.0000%> (-1.8454%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	53.9957% <ø> (-2.3014%)	⬇️
parser	∅ <ø> (∅)
br	51.3609% <ø> (+5.0297%)	⬆️

[windtalker]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, windtalker

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-25 09:56:51.13893156 +0000 UTC m=+1889038.161177948: ☑️ agreed by hawkingrei.
• 2024-03-25 10:33:38.90644098 +0000 UTC m=+1891245.928687369: ☑️ agreed by windtalker.