test(front-matter): remove double tests in any_test.ts

[timreichen]

This PR removes tests in front-matter/any_test.ts that are already covered by front-matter/json_test.ts, front-matter/toml_test.ts and front-matter/yaml_test.ts.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.68%. Comparing base (75ecea0) to head (2cd22ba).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6474      +/-   ##
==========================================
- Coverage   95.68%   95.68%   -0.01%     
==========================================
  Files         575      575              
  Lines       43192    43192              
  Branches     6475     6475              
==========================================
- Hits        41328    41327       -1     
- Misses       1825     1826       +1     
  Partials       39       39              

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[kt3k]

LGTM