KAFKA-20746: NPE in MetadataCache#toCluster#22723
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MetadataCache#toCluster builds a Cluster view for quota callbacks.
Previously, it filtered fenced brokers out of the broker-to-node map,
but partition metadata can still reference fenced brokers as replicas.
When such replicas were converted to PartitionInfo, the missing broker
entry could cause a NullPointerException.
Include all registered brokers in the broker-to-node map so fenced
replicas can be represented as offline replicas in the generated
Cluster.