test: fix data race in scan locks (#57299)

[ti-chi-bot]

This is an automated cherry-pick of #57299

What problem does this PR solve?

Issue Number: close #57298
Problem Summary:
As title.

What changed and how does it work?

add mutex for race functions.

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

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BornChanger

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-13 05:45:37.28976554 +0000 UTC m=+590127.378568083: ☑️ agreed by BornChanger.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-8.1@65fd2ad). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #58213   +/-   ##
================================================
  Coverage               ?   71.1738%           
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  Files                  ?       1468           
  Lines                  ?     423674           
  Branches               ?          0           
================================================
  Hits                   ?     301545           
  Misses                 ?     101610           
  Partials               ?      20519           

Flag	Coverage Δ
unit	71.1738% <ø> (?)

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

Components	Coverage Δ
dumpling	52.9656% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	41.2113% <0.0000%> (?)

[3pointer]

merged into #57279

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

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[ti-chi-bot]

@ti-chi-bot: 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
idc-jenkins-ci-tidb/unit-test	46d2085	link	true	/test unit-test

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