KIP-1120 — AppInfo metrics don't contain the client-id

Accepted Kafka 4.2 MetricsConnect

Fixes AppInfo metrics registration for Kafka Connect workers and MirrorMaker 2 clients to include the client-id label, aligning them with the behavior of standalone producer, consumer, and admin clients. AppInfo metrics (start-time-ms, commit-id, version) lack client-id tags for worker and MM2 contexts, making it impossible to distinguish metrics from multiple workers or MM2 instances sharing the same JVM.

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