perf: run dev.createEnvironment and build.createEnvironment concurrently

[sapphi-red]

Description

dev.createEnvironment was called one-by-one for each environment, but I think we can call these concurrently.

[sapphi-red]

/ecosystem-ci run

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/vite@20699

commit: 9723372

[vite-ecosystem-ci]

📝 Ran ecosystem CI on 1199a16: Open

suite	result	latest scheduled
laravel	❌ failure	❌ failure
vike	✅ success	❌ failure
vite-environment-examples	❌ failure	❌ failure
waku	✅ success	❌ failure

✅ analogjs, quasar, nuxt, astro, histoire, ladle, rakkas, sveltekit, one, qwik, marko, vite-plugin-react, react-router, unocss, vite-plugin-cloudflare, storybook, vite-plugin-rsc, vite-plugin-vue, vite-plugin-svelte, vite-plugin-pwa, vitest, vitepress, vite-setup-catalogue, vuepress

[bluwy]

It looks like in build these are also called sequentially. If we decide to call in concurrently now, I think we should do the same for dev and build for consistency.

From a brief look at the build code, it seems tricky to do in parallel though.

[sapphi-red]

Good catch! I've updated build.createEnvironment to run concurrently. I left the config loading as sequential to be safe.