fix: don't use sockets if provider is stackblitz

[OrbisK]

🔗 Linked issue

fixes#948fixesnuxt/nuxt#32571

❓ 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 PR disables the socket usage on stackblitz. It does also allow opting out of sockets via NUXT_SOCKET=0

[pkg-pr-new]

nuxt-cli-playground

npm i https://pkg.pr.new/create-nuxt@949

npm i https://pkg.pr.new/nuxi@949

npm i https://pkg.pr.new/@nuxt/cli@949

commit: 39b535c

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@048ad16). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
packages/nuxi/src/commands/dev.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #949 +/- ##
=======================================
Coverage ? 12.50% =======================================
Files ? 74 Lines ? 3901 Branches ? 112 =======================================
Hits ? 488 Misses ? 3379 Partials ? 34 

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[codspeed-hq]

CodSpeed Performance Report

Merging #949 will not alter performance

_{Comparing OrbisK:stackblitz-dev-socket (39b535c) with main (048ad16)}

Summary

✅ 2 untouched benchmarks