refactor(yaml): inline readSingleQuotedScalar()

[timreichen]

Ref: #5749

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.27%. Comparing base (3946983) to head (30edb84).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5827      +/-   ##
==========================================
- Coverage   96.28%   96.27%   -0.02%     
==========================================
  Files         479      479              
  Lines       38746    38744       -2     
  Branches     5621     5622       +1     
==========================================
- Hits        37306    37299       -7     
- Misses       1397     1402       +5     
  Partials       43       43              

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[iuioiua]

Thank you