KIP-548 — Add Option to enforce rack-aware custom partition reassignment execution

Discussion BrokerAdmin

KIP-548 proposes making `kafka-reassign-partitions.sh --execute` enforce rack-aware placement by default, rejecting a reassignment plan where any replica set has two replicas in the same rack, with an explicit `--disable-rack-aware` flag to override. Currently, rack awareness is only validated when the `--generate` option computes the plan; manually crafted or tool-generated reassignments can silently violate rack isolation, reducing fault domain separation.

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