Tests do not delete exe files

[Salvakiya]

Description

Running the tests leaves residual exe files

How To Reproduce

Steps to reproduce the behavior:
run tests on windows

Expected Behavior

exe files should clean themselves up as they do on linux

Logs & Additional Context

the fix should be in kit/tests/example.rs -> run_example_test function

need to conditionally set the executable_path if on windows to be 'with_extension("exe")'

[walker84837]

PR #10 should fix this problem. Please double-check and see if it works.