perf: enable Rspack incremental build by default

[chenjiahan]

Summary

• Enable Rspack incremental build by default because it is stable enough and can bring HMR performance improvements.
• Removed the EXPERIMENTAL_RSPACK_INCREMENTAL environment variable

If you run into any issues, you can switch to the safe and stable incremental, which is consistent with previous behavior, by adding the following configuration:

export default defineConfig({
  tools: {
    rspack: {
      experiments: {
        incremental: 'safe',
      },
    },
  },
});

Related Links

• https://rspack.dev/config/experiments#experimentsincremental

Checklist

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

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