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Fix lifetime of Darwin SubscriptionCallback to avoid shutdown crashes. (
#22324) The basic issue we could run into is that the Matter stack would shut down while our async block was still running on our client queue, and by the time the "delete this object" block was queued on the Matter queue that queue would be paused. Then if the stack was restarted the queue would be unpaused, and the deletion of the ReadClient would happen early in stack startup, when things were not in a good state yet. The fix is to make sure we queue the async deletion without going through the client queue first, and avoid doing the async bits altogether when we can (when the subscription itself errors out). Fixes #22320
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