[ISSUE #8728] Add more test coverage for TopicQueueMappingCleanService

[yx9o]

Fixes #8728 .

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.55%. Comparing base (945e7ea) to head (3a668ea).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8729      +/-   ##
=============================================
+ Coverage      47.53%   47.55%   +0.02%     
+ Complexity     11551    11548       -3     
=============================================
  Files           1279     1279              
  Lines          89562    89562              
  Branches       11516    11516              
=============================================
+ Hits           42569    42590      +21     
+ Misses         41773    41719      -54     
- Partials        5220     5253      +33     

Flag	Coverage Δ
	47.55% <ø> (+0.05%)	⬆️

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[yx9o]

Hi @ShannonDing , please help review, thank you.