refactor(yaml): cleanup `detectType()`

[timreichen]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.76923% with 5 lines in your changes missing coverage. Please review.

Project coverage is 96.23%. Comparing base (b91817f) to head (3757fff). Report is 3 commits behind head on main.

Files	Patch %	Lines
yaml/_dumper_state.ts	80.76%	5 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5759   +/-   ##
=======================================
  Coverage   96.23%   96.23%           
=======================================
  Files         479      479           
  Lines       38719    38719           
  Branches     5614     5614           
=======================================
+ Hits        37262    37263    +1     
+ Misses       1416     1415    -1     
  Partials       41       41           

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