[ISSUE #8465] Add more test coverage for ConsumeMessagePopConcurrentlyService

[yx9o]

Fixes #8465 .

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.94%. Comparing base (f1fe4bf) to head (39ab493).
Report is 100 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #8466      +/-   ##
=============================================
+ Coverage      45.92%   45.94%   +0.01%     
- Complexity     11125    11127       +2     
=============================================
  Files           1274     1274              
  Lines          89000    89000              
  Branches       11443    11443              
=============================================
+ Hits           40871    40888      +17     
+ Misses         43032    42991      -41     
- Partials        5097     5121      +24     

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