KIP-901 — Add connectorDeleted flag when stopping tasks

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Adds a Task#stop(boolean connectorDeleted) overload with a default implementation delegating to stop(), allowing task implementations to perform additional cleanup (e.g., removing database triggers or external queues) when the connector is being permanently deleted. Extending KIP-883's connector-level isDeleted flag to the task level ensures tasks can also react to deletion, not just the connector lifecycle.

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