refactor(yaml): remove repeat helper function

[timreichen]

• replaces repeat helper function with built in String.prototype.repeat()

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.81%. Comparing base (6a28a21) to head (72fc6ef).

Files	Patch %	Lines
yaml/_dumper.ts	50.00%	1 Missing ⚠️
yaml/_loader.ts	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5303      +/-   ##
==========================================
- Coverage   95.81%   95.81%   -0.01%     
==========================================
  Files         457      457              
  Lines       37893    37879      -14     
  Branches     5568     5567       -1     
==========================================
- Hits        36307    36293      -14     
  Misses       1546     1546              
  Partials       40       40              

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