When using `window.onerror` in the bootstrap script that is hosted in a CDN the error message will show `"Script error."` instead of a proper error message. This is because of the [cross-origin](https://blog.sentry.io/2016/05/17/what-is-script-error/) script. To fix this issue a `crossorigin="anonymous"` attribute needs to be added in the script tag.

Currently, `bootstrapScripts` supports [`src` and `integrity`](https://github.com/facebook/react/blob/0fce6bb498357feb4465859912004b2e20fe7084/packages/react-dom-bindings/src/server/ReactDOMServerFormatConfig.js#L226) as configurations, should it also supports a `crossorigin` property?


<body>
            <Suspense fallback={'loading...'}>
              <AsyncText text="Hello" />
            </Suspense>
          </body>
        </html>,
        {
          unstable_externalRuntimeSrc: 'src-of-external-runtime',
        },
      );
      pipe(writable);
    });
    
    
    
    expect(
      Array.from(document.head.getElementsByTagName('script')).map(
        n => n.outerHTML,
      ),
    ).toEqual(['<script src="src-of-external-runtime" async=""></script>']);
    expect(getVisibleChildren(document)).toEqual(
      <html>
        <head />
        <body>loading...</body>
      </html>,
    );
  });
  
  it('does not send script tags for SSR instructions when using the external runtime', async () => {
    function App() {