feat(config): support vitest browser mode

[JessicaSachs]

🔗 Linked issue

Resolves #1106

❓ 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

There was no example for Vitest Browser Mode. In order to get it working, I created an example, and then I had to make two code changes.

• Changing the setup files from resolving to "entry.ts" vs "entry" may be due to a file path resolution issue?
• Removing the [process.env.NODE_ENV] definition caused the process is not defined error to go away.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@nuxt/test-utils@1271

commit: 103876e

[danielroe]

Thank you ❤️