Enhance Visibility Into Reactor FlatMapMain

[deleonenriqueta]

Resolves Issue #2266

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.52%. Comparing base (9d3b99c) to head (4e94244).
Report is 112 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2308      +/-   ##
============================================
- Coverage     70.58%   70.52%   -0.06%     
- Complexity     9975    10029      +54     
============================================
  Files           842      844       +2     
  Lines         40373    40619     +246     
  Branches       6119     6158      +39     
============================================
+ Hits          28497    28647     +150     
- Misses         9098     9183      +85     
- Partials       2778     2789      +11     

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