Re: [whatwg/streams] Prot writable stream abort tests to wpt (#540)

The pattern we've been using for that is to put

```
const error1 = new Error('error1');
error1.name = 'error1';
```

at the top of the file (plus maybe error2 if you have multiple errors and want to distinguish), then later doing

```js
return promise_rejects(t, error1, writer.write(), 'err message');
```

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