*: make TestBatchEvict stable

[rleungx]

What problem does this PR solve?

Issue Number: Close #8560

What is changed and how does it work?

We only try to schedule according to the configuration at the most specified times. However, the operator may be the same and be removed due to duplication.

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
pull-integration-realcluster-test	6cd48c3	link	false	/test pull-integration-realcluster-test

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.61%. Comparing base (571c59b) to head (6cd48c3).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8590      +/-   ##
==========================================
- Coverage   77.66%   77.61%   -0.05%     
==========================================
  Files         474      474              
  Lines       61884    61873      -11     
==========================================
- Hits        48061    48023      -38     
- Misses      10277    10317      +40     
+ Partials     3546     3533      -13     

Flag	Coverage Δ
unittests	77.61% <ø> (-0.05%)	⬇️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [HuSharp,lhy1024]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-03 05:44:29.155963981 +0000 UTC m=+336793.674016905: ☑️ agreed by lhy1024.
• 2024-09-03 07:44:48.255432004 +0000 UTC m=+344012.773484929: ☑️ agreed by HuSharp.