CSF3: Fix custom render function

[shilman]

Issue: N/A

What I did

storybookjs/builder-vite#76 revealed that the client-api exports are screwed up for the CSF3 global render override. This fixes them.

Self-merging @IanVS

How to test

Add this to preview.js in examples/react-ts to override the global render function:

export const render = (args, { parameters }) => {
  const Component = parameters.component;
  return (
    <div style={{ border: '3px solid' }}>
      <Component {...args} />
    </div>
  );
};

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