executor: fix flaky test by correctly cancelling a query

[ekexium]

What problem does this PR solve?

Issue Number: close #55489

Problem Summary:

What changed and how does it work?

It seems the query can not be cancelled, possibly leading to goroutine leak in the tests.

rs, err := tk1.Exec("select * from normal")

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 @ekexium. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.2828%. Comparing base (b71f0c0) to head (3c0a5e2).
Report is 58 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #57140         +/-   ##
=================================================
- Coverage   72.9864%   57.2828%   -15.7037%     
=================================================
  Files          1657       1797        +140     
  Lines        457545     650034     +192489     
=================================================
+ Hits         333946     372358      +38412     
- Misses       103056     253422     +150366     
- Partials      20543      24254       +3711     

Flag	Coverage Δ
integration	37.5859% <ø> (?)
unit	73.3406% <ø> (+1.0783%)	⬆️

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

Components	Coverage Δ
dumpling	55.2602% <ø> (+2.3124%)	⬆️
parser	∅ <ø> (∅)
br	52.7970% <ø> (+7.0968%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [hawkingrei,lcwangchao]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-06 00:36:55.06943291 +0000 UTC m=+1001327.908588452: ☑️ agreed by hawkingrei.
• 2024-11-12 07:02:17.095538535 +0000 UTC m=+339699.286407524: ☑️ agreed by lcwangchao.

[purelind]

/test all

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/test all

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[hawkingrei]

/retest

[tiprow]

@ekexium: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	3c0a5e2	link	true	/test fast_test_tiprow

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