chore(vscode): remove eslint.experimental.useFlatConfig

[shinGangan]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ 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

eslint.experimental.useFlatConfig has been deprecated in vscode-eslint v3.0.5.
Flat Config is enabled by default in ESLint v9.
So I removed the option.

• ref1: https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint
• ref2: https://eslint.org/docs/latest/use/configure/migration-guide#visual-studio-code-support

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[shinGangan]

Hi @tobiasdiez , please review when you have a time 🙏
This PR has low review priority.

[tobiasdiez]

Thanks!