fix: allow to configure dev.hmr in environments

[chenjiahan]

Summary

Should allow to configure dev.hmr in environments:

export default defineConfig({
  environments: {
    web: {
      source: {
        entry: {
          index: './src/index.tsx',
        },
      },
      dev: {
        hmr: true,
      },
    },
    web2: {
      source: {
        entry: {
          index: './src/index2.tsx',
        },
      },
      dev: {
        hmr: false,
      },
    },
  },
});

Checklist

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

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