disttask: fix flaky multi task test

[ywqzzy]

What problem does this PR solve?

Issue Number: close #49039

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]

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lance6716, okJiang, XuHuaiyu

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-30 07:43:16.000178936 +0000 UTC m=+1081424.665405153: ☑️ agreed by XuHuaiyu.
• 2023-11-30 07:45:15.748782268 +0000 UTC m=+1081544.414008448: ☑️ agreed by lance6716.

[lance6716]

/check-issue-triage-complete

[codecov]

Codecov Report

Merging #49040 (43c1e87) into master (27fc7ea) will increase coverage by 1.5264%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #49040        +/-   ##
================================================
+ Coverage   70.9930%   72.5195%   +1.5264%     
================================================
  Files          1368       1391        +23     
  Lines        403986     410979      +6993     
================================================
+ Hits         286802     298040     +11238     
+ Misses        97214      94130      -3084     
+ Partials      19970      18809      -1161     

Flag	Coverage Δ
integration	43.6744% <ø> (?)
unit	70.9930% <ø> (ø)

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

Components	Coverage Δ
dumpling	53.9663% <ø> (ø)
parser	∅ <ø> (∅)
br	48.3702% <ø> (-4.6121%)	⬇️