`github/async-preventdefault` should not flag calls before the first `await`

`preventDefault()` works fine before the first `await` in an async function, so this code works as expected, but if currently flagged:

```js
document.querySelector('a').addEventListener('click', e => {
e.preventDefault();
await fetch('/');
});
```

It's only after the first `await`, where `preventDefault` stops working. I suggest the rule to only flag `preventDefault()` after the first `await`.

Start by locating the github/async-preventdefault rule and its existing tests. Add coverage for preventDefault() before and after the first await, then verify the rule flags only the latter case.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.