[whatwg/streams] Should cancelation error from UnderlyingSource be transferred too? (Issue #1259)

```js
b = new ReadableStream({
    cancel() {
      throw new Error("Hello");
    }
})
transferred = structuredClone(b, { transfer: [b] })

// This resolves as it never gets the error message back, with its port immediately closed
transferred.cancel();
```

Couldn't find a relevant discussion, but WPT explicitly tests it [to not wait for the underlying source cancel](https://github.com/web-platform-tests/wpt/blob/4ec997cb455c429be5b26681b0515428e086cac1/streams/transferable/readable-stream.html#L174-L185). What was the reason behind it?

I don't have a good argument against the current behavior, just out of curiosity.

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