tests: fix TestKeyspaceServiceLimitAPI

[rleungx]

What problem does this PR solve?

Issue Number: Close #9838.

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

@rleungx: 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
non-block/pull-unit-test-next-gen	69c9daa	link	false	/test pull-unit-test-next-gen

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JmPotato, lhy1024

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-10-15 10:10:52.940216256 +0000 UTC m=+261759.017468816: ☑️ agreed by lhy1024.
• 2025-10-15 10:17:22.135638349 +0000 UTC m=+262148.212890899: ☑️ agreed by JmPotato.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.86%. Comparing base (33d00c5) to head (69c9daa).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9839      +/-   ##
==========================================
+ Coverage   76.82%   76.86%   +0.04%     
==========================================
  Files         491      491              
  Lines       78440    78463      +23     
==========================================
+ Hits        60261    60311      +50     
+ Misses      14478    14454      -24     
+ Partials     3701     3698       -3     

Flag	Coverage Δ
unittests	76.86% <100.00%> (+0.04%)	⬆️

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