Show unsupported platforms error message

[p-malecki]

This PR fixes fixes issue where error messages for unsupported platforms were not displayed and prevents Xcode errors from appearing on Windows by ensuring the checkXcodeExists function is only executed on macOS.

Previously, an error related to the OS const in platform.ts was always thrown before the check in extension.ts. This change ensures the verification process happens correctly.

Fixes #620

How Has This Been Tested:

• run extension on currently unsupported platform (linux)
• run extension and check the logs for any errors caused by xcrun on Windows

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Name	Status	Preview	Comments	Updated (UTC)
radon-ide	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 18, 2024 10:13am