feat(config): support vitest workspaces with defineVitestProject

[danielroe]

🔗 Linked issue

closes #1124
resolves #1123

❓ 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

this is the beginning of moving to vitest workspaces

• remove environmentMatchGlobs usage
• investigate why workspaces are not working with programmatic startVitest usage (cc: @antfu)
• move more configuration into the workspace config to avoid 'leakage'

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@nuxt/test-utils@1258

commit: 5951969