refactor(yaml): cleanup inspectNode()

[timreichen]

• replaces duplicatesIndexes array with Set of objects
• reduces nesting and adds early returns

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.81%. Comparing base (81943c3) to head (221642e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5311      +/-   ##
==========================================
- Coverage   95.81%   95.81%   -0.01%     
==========================================
  Files         458      458              
  Lines       37883    37870      -13     
  Branches     5567     5566       -1     
==========================================
- Hits        36298    36285      -13     
  Misses       1545     1545              
  Partials       40       40              

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[iuioiua]

Nice cleanup. Thank you.