KIP-1079 — Deprecate `delete-config` of TopicCommand

Accepted Kafka 4.0 Admin

Deprecates the `--delete-config` option of `kafka-topics.sh` (`TopicCommand`) with a plan to remove it in Kafka 5.0. The `--delete-config` command is currently a no-op (it performs no actual deletion), so retaining it without deprecation misleads users into believing topic-level config keys can be removed via this path.

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