chore: avoid including test files in dist directory

[frederikprijck]

Avoid including the test files in the dist directory, as they are currently included when publishing to npm.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.90%. Comparing base (4a5834f) to head (5006116).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2396   +/-   ##
=======================================
  Coverage   87.90%   87.90%           
=======================================
  Files          37       37           
  Lines        4127     4127           
  Branches      818      818           
=======================================
  Hits         3628     3628           
  Misses        496      496           
  Partials        3        3           

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