feat(vite, webpack): allow client-side sourcemaps in production

[danielroe]

🔗 Linked issue

resolvesnuxt/nuxt#14823

❓ 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 like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This PR bundles a couple of changes to sourcemap handling:

1. fixes a bug where nitro sourcemaps were not respecting sourcemap config (a typo)
2. generates client-side sourcemaps for webpack/vite in production if sourcemap is set to true (or allows either falling back to previous behaviour with new option 'server' or generating only client-side sourcemaps with 'client')
3. defaults to previous behaviour (generates all sourcemaps in dev, and only server-side sourcemaps in production)
4. fixes (unrelated) issue with perf(nuxt): tree-shake client-only components from ssr bundle #5750 where client-only components were being tree-shaken out of client build as well 🙈

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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[pi0]

LGTM. refactor note: i was thinking false | { client, server } from resolved options is more convenient but we can do it later if there are more client || server conditions needed to enable sourcemap for plugins...