Optimize CrashRecoverySchedule instance selection #25160
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Previously CrashRecoverySchedule::update cloned the entire instances vector and then drained a subrange, causing unnecessary O(n) allocations and copies of all Instance values on every update tick.
This change replaces self.instances.clone().drain(..).collect() with self.instances[range].to_vec() for the relevant ranges, preserving behavior and panic semantics while only cloning the actually needed subset of instances.