fix(react): update rspack to include styles in the main bundle (#28478)

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## Current Behavior
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Currently, styles are not included in the main bundle by default.
## Expected Behavior
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Similar to webpack, styles should be included by default.
## Related Issue(s)
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merged. -->

Fixes #28465

packages/react/src/generators/application/files/base-rspack/src/main.tsx__tmpl__

@@ -3,6 +3,7 @@ import * as ReactDOM from 'react-dom/client';
 <% if (routing) { %>import { BrowserRouter } from 'react-router-dom';<% } %>
 
 import App from './app/<%= fileName %>';
+import './styles.<%= style %>'
 
 const root = ReactDOM.createRoot(document.getElementById('root') as HTMLElement);
 root.render(