koordlet: fix flaky test in pleg

[saintube]

Ⅰ. Describe what this PR does

• Fix another flaky test in koordlet PLEG, which has a little chance of failing in the resource-constrained scenarios.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.55%. Comparing base (7e944d5) to head (43108be).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2061   +/-   ##
=======================================
  Coverage   68.55%   68.55%           
=======================================
  Files         430      430           
  Lines       39387    39387           
=======================================
+ Hits        27000    27003    +3     
+ Misses      10047    10046    -1     
+ Partials     2340     2338    -2     

Flag	Coverage Δ
unittests	68.55% <ø> (+<0.01%)	⬆️

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[ZiMengSheng]

/lgtm

[hormes]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes

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