Update test-contracts.md

[ebulku]

Every step of this guide is running smoothly in Windows, except this command that is setting also the environment variable.

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 2, 2024 10:29am

[kanej]

I have tested this on Windows. It triggers the gas reporting.

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