[core-http] abortSignal not able to abort download stream

[jeremymeng]

using code similar to following to download a big file then abort the operation

        const aborter = new AbortController();
        const res = await blobClient.download(0, undefined, {
          abortSignal: aborter.signal,
        });
        console.log(`download call returned`);

        const stream = res.readableStreamBody;

        stream.on("close", () => {
          console.log(`stream closed`);
        });
        stream.destroy();
        aborter.abort();

Expect:
The underlying download stream should also get destroyed.

Actual:
The download stream is still receiving data. This can be verified by running netstat --tcp and see the connection to Azure Blob is still in ESTABLISHED state, and Recv-Q indicates incoming data.

Looking at our core-http code, we pass a abortSignal to node-fetch, however, after we got response back, we removed the listener. It seems an issue to me, as we would want to the ability to cancel the underlying download stream.