Fix isPerforming for observable query in React to set it to true as default value

[Copilot]

Summary

Fixed

• isPerforming for observable queries now starts as true and transitions to false when data arrives, enabling loading states on slow connections

Changed initial state in useObservableQuery from QueryResultWithState.empty() to QueryResultWithState.initial(). The initial() method already existed with isPerforming: true.

// Now you can show loading UI while waiting for WebSocket data
const [result] = useObservableQuery(MyQuery);

if (result.isPerforming) {
  return <Spinner />;
}
return <DataView data={result.data} />;

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Fix isPerforming for observable query in React to set it to true as default value and false when it starts receiving data.</issue_title>
<issue_description>On slow connections you could have a period from initiating the query till the first messages comes back over WebSockets. For this time it would be good to be able to show a spinner / skeleton while waiting.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Fix isPerforming for observable query in React to set it to true as default value and false when it starts receiving data. #1483

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[github-actions]

NuGet packages for this PR, e.g. Cratis.Arc:
https://github.com/cratis/arc/packages/1655206?version=18.1.2-pr1526.c49c480