refactor(yaml): inline readBlockMapping()

[timreichen]

Ref: #5749

[codecov]

Codecov Report

Attention: Patch coverage is 81.93548% with 28 lines in your changes missing coverage. Please review.

Project coverage is 96.26%. Comparing base (cde346d) to head (35da660).
Report is 1 commits behind head on main.

Files	Patch %	Lines
yaml/_loader_state.ts	81.93%	25 Missing and 3 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5847   +/-   ##
=======================================
  Coverage   96.26%   96.26%           
=======================================
  Files         479      479           
  Lines       38764    38761    -3     
  Branches     5623     5623           
=======================================
  Hits        37315    37315           
+ Misses       1406     1403    -3     
  Partials       43       43           

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[iuioiua]

Thank you