fix(build): handle preload treeshaking for commas

[bluwy]

Description

fix #17466

We didn't handle the case for syntax like this.

const foo = (await import('foo')).foo, bar = ...

The trailing comma was incorrectly captured by the regex. I updated it to capture the .foo part properly.

---

I also added additional handling for leading commas:

const foo = ..., { bar } = await import('bar')

I adjusted the first portion of the regex to accommodate it.

[stackblitz]

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[bluwy]

/ecosystem-ci run

[vite-ecosystem-ci]

📝 Ran ecosystem CI on 950c8f3: Open

suite	result	latest scheduled
analogjs	❌ failure	✅ success
histoire	✅ success	❌ failure
nuxt	❌ failure	❌ failure
vite-plugin-react-pages	❌ failure	❌ failure
vite-setup-catalogue	✅ success	❌ failure
vitest	❌ failure	❌ failure

✅ astro, ladle, laravel, marko, previewjs, quasar, qwik, rakkas, remix, sveltekit, unocss, vike, vite-plugin-pwa, vite-plugin-react, vite-plugin-react-swc, vite-plugin-svelte, vite-plugin-vue, vitepress

[bluwy]

The analog fail seems to be a build issue due to recent changes on their end. The last passing run was two days ago.

[patak-dev]

Thanks for the quick fix! Looks good to me ❤️