Give the user a hint on Windows when khiops_env.cmd fails

[tramora]

khiops_env.cmd failure on Windows is usually caused by security policies preventing executables from running if they are located outside approved locations

Fixes #613

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TODO Before Asking for a Review

• Rebase your branch to the latest version of main (or main-v10)
• Make sure all CI workflows are green
• When adding a public feature/fix: Update the Unreleased section of CHANGELOG.md (no date)
• Self-Review: Review "Files Changed" tab and fix any problems you find
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  • If there are any problems it is faster to iterate by building locally the API Docs