KIP-1351 — Add --cancel-all to kafka-reassign-partitions

Discussion Admin

Adds a --cancel-all action to kafka-reassign-partitions.sh that lists in-flight reassignments via listPartitionReassignments and cancels every one with non-empty adding/removing replica sets through alterPartitionReassignments with replicas = null, leaving --cancel unchanged. Cancelling all reassignments today requires reconstructing the original JSON plan or scripting the Admin calls by hand, which is slow and error-prone during an incident when the plan file is missing or stale.

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