refactor(yaml): inline readBlockSequence()

[timreichen]

Ref: #5749

[codecov]

Codecov Report

Attention: Patch coverage is 84.31373% with 8 lines in your changes missing coverage. Please review.

Project coverage is 96.23%. Comparing base (310b1a3) to head (7f3af6d).
Report is 1 commits behind head on main.

Files	Patch %	Lines
yaml/_loader_state.ts	84.31%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5776      +/-   ##
==========================================
- Coverage   96.23%   96.23%   -0.01%     
==========================================
  Files         481      481              
  Lines       38745    38745              
  Branches     5617     5617              
==========================================
- Hits        37286    37285       -1     
- Misses       1418     1419       +1     
  Partials       41       41              

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