Removed ios targets from KMP tests

[gmazzo]

The goal BuildConfigPluginKMPExpectActualTest is to validate the correctness of expect/actuals propagation. We don't need to have native iOS compilation for that, and it's taking too much CI time

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.41%. Comparing base (bb55bb5) to head (0923773).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #340   +/-   ##
=======================================
  Coverage   57.41%   57.41%           
=======================================
  Files          25       25           
  Lines         904      904           
  Branches      215      215           
=======================================
  Hits          519      519           
  Misses        321      321           
  Partials       64       64           

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