refactor(yaml): inline readDoubleQuotedScalar()

[timreichen]

Ref: #5749

[codecov]

Codecov Report

Attention: Patch coverage is 92.06349% with 5 lines in your changes missing coverage. Please review.

Project coverage is 96.27%. Comparing base (7539060) to head (0591624).
Report is 1 commits behind head on main.

Files	Patch %	Lines
yaml/_loader_state.ts	92.06%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5838      +/-   ##
==========================================
- Coverage   96.27%   96.27%   -0.01%     
==========================================
  Files         479      479              
  Lines       38766    38764       -2     
  Branches     5623     5624       +1     
==========================================
- Hits        37321    37319       -2     
  Misses       1402     1402              
  Partials       43       43              

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[iuioiua]

Thank you