refactor(front-matter): remove any tests

[timreichen]

This PR removes front-matter/any_test.ts. All tests in that file 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 95.67%. Comparing base (75ecea0) to head (89a79a6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6474      +/-   ##
==========================================
- Coverage   95.68%   95.67%   -0.01%     
==========================================
  Files         575      575              
  Lines       43192    43189       -3     
  Branches     6475     6473       -2     
==========================================
- Hits        41328    41322       -6     
- Misses       1825     1828       +3     
  Partials       39       39              

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