storage-client: don't panic if PersistWriteWorker disappears #20975
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On shutdown, the PersistWriteWorker can disappear while we're awaiting it to write. This can happen during shutdown, so handle this situation gracefully by returning errors to the listeners.
Motivation
This PR fixes a recognized bug. Multiple CI failures.
Checklist
$T ⇔ Proto$T
mapping (possibly in a backwards-incompatible way), then it is tagged with aT-proto
label.