Fizz: Prevent `UnhandledPromiseRejectionWarning` if `renderToReadableStream` throws#24043

sebmarkbage merged 1 commit intofacebook:mainfacebook/react:mainfrom

eps1lon:fix/fizz/prevent-unhandled-promise-rejection-if-shell-errorseps1lon/react:fix/fizz/prevent-unhandled-promise-rejection-if-shell-errorsCopy head branch name to clipboard