perf!: disable polyfill injection by default

[chenjiahan]

Summary

Set output.polyfill to 'off' by default, this can reduce the polyfill code and generate smaller bundles by default.

If your application need polyfill, please set output.polyfill to 'usage' or 'entry':

// rsbuild.config.ts
export default {
  output: {
    polyfill: 'usage'
  }
};

See the vote on Twitter: https://x.com/rspack_dev/status/1808439138439274780

Related Links

#2776

Checklist

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

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