*: fix flaky test TestTiDBTrx

[hawkingrei]

What problem does this PR solve?

Issue Number: close #53901

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

[hawkingrei]

/retest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.8023%. Comparing base (fedf3b7) to head (375ef78).
Report is 6 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #53932         +/-   ##
=================================================
- Coverage   72.5455%   55.8023%   -16.7432%     
=================================================
  Files          1508       1628        +120     
  Lines        431744     602625     +170881     
=================================================
+ Hits         313211     336279      +23068     
- Misses        99128     243247     +144119     
- Partials      19405      23099       +3694     

Flag	Coverage Δ
integration	37.1880% <ø> (?)
unit	71.5323% <ø> (-0.0028%)	⬇️

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

Components	Coverage Δ
dumpling	52.9656% <ø> (ø)
parser	∅ <ø> (∅)
br	50.7390% <ø> (+8.5922%)	⬆️

[MyonKeminta]

LGTM. Btw the purpose of this line of test needs some explanation in comments and better have a link to the issue #53026 . It took me some time to understand the purpose of this test...

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-11 10:27:22.744400086 +0000 UTC m=+460396.797712024: ☑️ agreed by Defined2014.
• 2024-06-11 11:35:38.077452665 +0000 UTC m=+464492.130764588: ☑️ agreed by MyonKeminta.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cfzjywxk, Defined2014, MyonKeminta, wjhuang2016

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #53953.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #54573.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #54940.