Throwing an error while HTTP streaming is enabled causes response to never be sent

## Description

When HTTP streaming is enabled with `app.setup({ enableHttpStream: true })`, throwing any error causes the the response to never be sent and never logging anything.

## Expected behavior

Throwing an error causes a response with status 500 to be sent and the error to be logged, same as when HTTP streaming is disabled.

## Reproduction

```ts
import {
app,
type HttpRequest,
type InvocationContext,
type HttpResponseInit,
} from "@azure/functions";

app.setup({ enableHttpStream: true });

app.http("proxy", {
methods: ["POST"],
handler: proxy,
});

export async function proxy(
request: HttpRequest,
context: InvocationContext
): Promise {
throw new Error("Kaboom! 💣");
}
```

Setting `enableHttpStream: false` results in the expected behavior, but then streaming won't work.