[v10.4.x] GenAI: Update the component only when the response is fully generated #83895
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Backport 112c0e7 from #83879
Fixes #79611, #76848
Problem
The previous approach triggered a set state for every stream response. This was causing the component to enter into many re-renders, where React was stopping them and missing part of the message.
Solution
Do not set the state on every stream result, and accumulate the response to only commit the set state when it is fully completed. This changes the experience, but we want to try with this approach, to ensure the experience is performant enough.