Use a single write transaction for DiscardLocal client resets on FLX realms #7110
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Updating the subscription store in a separate write transaction from the recovery means that we temporarily commit an invalid state. If the application crashes between committing the client reset diff and updating the subscription store, the next launch of the application would try to use the now-invalid pending subscriptions that should have been discarded.
This is the fairly uninteresting case; client reset with recovery can do much more invalid things than this if the process crashes. That'll be a significantly more involved thing to fix so I'm splitting it off to a subsequent PR.