chore(deps): bump Rsbuild v0.0.14, remove Modern.js plugin testing

[chenjiahan]

Summary

• bump Rsbuild v0.0.14, including some performance improvements, ref: https://github.com/web-infra-dev/rsbuild/releases/tag/v0.0.14
• remove Modern.js plugin testing, it it not used by Rspress.

Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

[netlify]

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