Remove unused KCL file

[jtran]

This is outdated, and nothing seems to use it.

[qa-wolf]

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Name	Status	Preview	Updated (UTC)
modeling-app	✅ Ready (Inspect)	Visit Preview	Apr 21, 2025 6:25pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.14%. Comparing base (7a90d02) to head (c76957f).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6383   +/-   ##
=======================================
  Coverage   85.14%   85.14%           
=======================================
  Files         108      108           
  Lines       46280    46280           
=======================================
  Hits        39405    39405           
  Misses       6875     6875           

Flag	Coverage Δ
rust	85.14% <ø> (ø)

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