feat!: add browserslist to context.environments

[chenjiahan]

Summary

Add browserslist to context.environments.

const pluginTarget = (): RsbuildPlugin => ({
  name: 'rsbuild:target',
  setup(api) {
    api.modifyBundlerChain((chain, { environment }) => {
      const { browserslist } = api.context.environments[environment];
      console.log(browserslist);
    });
  },
});

BREAKING CHANGE: output.overrideBrowserslist no longer supports Record<RsbuildTarget, string[] for environment configuration.

Related Links

#2508
#2620

Checklist

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

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