[w3c/payment-request] Expected behaviours: paymentmethodchange event updates with a rejection (#898)

What's the expected behaviours should be if the paymentmethodchange event updates with a rejection? The following snippet demonstrates this scenario:

`request.addEventListener('paymentmethodchange', (event) => {
    event.updateWith(Promise.reject('Error for test'));
  });`

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https://github.com/w3c/payment-request/issues/898