How a page is rendered depends on whether or not we're streaming. For example, if we're just rendering to a `string` or we're generating a response for a crawler or other robot, we don't want React 18 to dynamically flush `<script>` tags to update Suspense boundaries as they resolve. Instead, we just want to wait for the full HTML to resolve and return a result similar to `renderToString`.
This is what `RequestContext` and the new/refactored `pipe` and `getStaticHTML` methods allow. They add a `requireStaticHTML` option that gets passed down. A follow-up PR will make sure this is `true` when serving a robot, and also ensure React is invoked appropriately.
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