[Backport 5.3.9104] completions: recover from panics in writeEvent #61755
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I timeboxed some time to work out why we call writeEvent once the request is done. My main idea is around request cancellation and the first event being an attribution error. However, I could not nail down an exact cause. Instead this is a change to isolate panics to the request it is happening in rather than taking down the whole process.
Test Plan: go test
Part of #60439
Backport c40b376 from #61754