refactor(yaml): inline readLineBreak()

[timreichen]

Ref: #5749

[iuioiua]

Thanks

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 3 lines in your changes missing coverage. Please review.

Project coverage is 96.25%. Comparing base (f14f74b) to head (7c65c08).
Report is 1 commits behind head on main.

Files	Patch %	Lines
yaml/_loader_state.ts	83.33%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5783   +/-   ##
=======================================
  Coverage   96.25%   96.25%           
=======================================
  Files         481      481           
  Lines       38738    38738           
  Branches     5615     5615           
=======================================
  Hits        37288    37288           
  Misses       1409     1409           
  Partials       41       41           

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