Abort fetch requests when component is removed

[maxpatiiuk]

When a component is removed before a network request is resolved, or an old request is replaced with a new one, the old request should be canceled. This would reduce wasted network bandwidth and reduce load on the back-end server.

Here is how to tell fetch to abort the request - https://developer.mozilla.org/en-US/docs/Web/API/AbortController/signal
Potentially, that could be integrated into the useAsyncState hook since that's where most network requests are made from on the front-end