refactor(yaml): inline storeMappingPair()

[timreichen]

Ref: #5749

[codecov]

Codecov Report

Attention: Patch coverage is 94.87179% with 4 lines in your changes missing coverage. Please review.

Project coverage is 96.27%. Comparing base (076acf5) to head (6273bbe).
Report is 1 commits behind head on main.

Files	Patch %	Lines
yaml/_loader_state.ts	94.87%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5779      +/-   ##
==========================================
+ Coverage   96.24%   96.27%   +0.02%     
==========================================
  Files         481      481              
  Lines       38743    38738       -5     
  Branches     5615     5615              
==========================================
+ Hits        37288    37294       +6     
+ Misses       1414     1403      -11     
  Partials       41       41              

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[iuioiua]

Please rebase

[iuioiua]

Thanks