refactor(yaml): remove anchor undefined check

[timreichen]

Cleanup from #6907

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.18%. Comparing base (13e5527) to head (51d083c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6915   +/-   ##
=======================================
  Coverage   94.17%   94.18%           
=======================================
  Files         584      584           
  Lines       43087    43079    -8     
  Branches     6875     6874    -1     
=======================================
- Hits        40578    40573    -5     
+ Misses       2457     2455    -2     
+ Partials       52       51    -1     

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