*: Fix data race in TestSetLabelsConcurrentWithGetLabel (#45579)

[ti-chi-bot]

This is an automated cherry-pick of #45579

What problem does this PR solve?

Issue Number: close #45578

Problem Summary:

What is changed and how it works?

Check List

Tests

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

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

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@5a5cad1). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #45588   +/-   ##
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  Misses                 ?      75644           
  Partials               ?      16441           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: crazycs520, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-07-26 15:39:15.593835013 +0000 UTC m=+368898.188365989: ☑️ agreed by crazycs520.
• 2023-07-27 08:45:23.259654494 +0000 UTC m=+430465.854185479: ☑️ agreed by hawkingrei.