KIP-897 — Publish a single kafka (aka core) Maven artifact in Apache Kafka 4.0

Discarded Admin

KIP-897 (discarded in favor of moving code out of the `core` module) proposed renaming the Maven artifact `kafka_2.13` to `kafka` in Apache Kafka 4.0 to reflect that only one Scala version would be supported after KIP-751 deprecated Scala 2.12. The dual-artifact build requires compiling and testing the project twice per release, and Java projects that consume the `core` module gain no benefit from the Scala version suffix in the artifact coordinates.

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