KIP-949 — Add flag to enable the usage of topic separator in MM2 DefaultReplicationPolicy

Accepted Kafka 3.6 MirrorMaker

Adds replication.policy.internal.topic.separator.enabled (default true) to DefaultReplicationPolicy, allowing users to opt out of using replication.policy.separator for naming internal offset sync and checkpoint topics. KIP-690 introduced the separator into internal topic naming, breaking backward compatibility for users who upgraded and had existing internal topics named with the old convention.

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