fix: [skip e2e] [2.5]data race in load test

[weiliu1031]

Related to #39701
pr: #39845

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.75%. Comparing base (52434cc) to head (b241447).
Report is 6 commits behind head on 2.5.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #39846      +/-   ##
==========================================
+ Coverage   81.00%   82.75%   +1.75%     
==========================================
  Files        1421     1118     -303     
  Lines      201313   173151   -28162     
==========================================
- Hits       163065   143292   -19773     
+ Misses      32546    24155    -8391     
- Partials     5702     5704       +2     

Components	Coverage Δ
Client	79.28% <ø> (ø)
Core	∅ <ø> (∅)
Go	82.90% <ø> (-0.03%)	⬇️

see 331 files with indirect coverage changes

[zhikunyao]

/run-cpu-e2e

[zhikunyao]

/run-cpu-e2e

[czs007]

/lgtm