chore: prepare lint script for no-unused-vars

[DonIsaac]

🔗 Linked issue

Not Applicable

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This PR explicitly denies violations of no-unused-vars for oxlint.

We are planning on bringing no-unused-vars out of our nursery category and making it a correctness rule in the near future. This PR will help ensure this does not break your CI. Thank you for using oxlint.

note: I am the product manager for oxlint

📝 Checklist

• I have linked an issue or discussion.
• I have added tests (if possible).
• I have updated the documentation accordingly.

[zoey-kaiser]

Hi @DonIsaac 👋

Thanks for the PR and the amazing work on oxlint!