refactor!: remove builderPlugins and migrate it to builderConfig.plugins

[SoonIter]

Summary

refactor!: replace builderPlugins with builderConfig.plugins

Related Issue

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

✅ Deploy Preview for rspress-v2 ready!

Name	Link
🔨 Latest commit	ca92812
🔍 Latest deploy log	https://app.netlify.com/projects/rspress-v2/deploys/6870deaa10db24000851cd8e
😎 Deploy Preview	https://deploy-preview-2371--rspress-v2.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[netlify]

✅ Deploy Preview for rspress ready!

Name	Link
🔨 Latest commit	ca92812
🔍 Latest deploy log	https://app.netlify.com/projects/rspress/deploys/6870deaa611dc70008291967
😎 Deploy Preview	https://deploy-preview-2371--rspress.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 78 (🔴 down 18 from production) Accessibility: 97 (no change from production) Best Practices: 92 (🟢 up 9 from production) SEO: 100 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[SoonIter]

We tend to change builderConfig to rsbuild. But currently, we cannot do this, as it would mean that the rspress plugin for V1 will be completely incompatible with v2...

defineConfig({
   rsbuild: {
     plugins: []
   }
})

[SoonIter]

#1891 (comment)