DSMON-1102: Add kafka_cluster_id tag to Kafka cluster metrics

[piochelepiotr]

What does this PR do?

This PR adds the kafka_cluster_id dynamic tag to all Kafka broker metrics collected by the Kafka integration. The tag is dynamically populated from the JMX bean kafka.server:type=KafkaServer,name=ClusterId and is added to metrics from the Kafka brokers.
Consumer and producer metrics are intentionally excluded from this change as they don't represent broker-level metrics.

Motivation

The Kafka cluster ID is a unique identifier for each Kafka cluster that is essential for building reliable observability features. By tagging all broker metrics with the cluster ID, we enable:
Cluster discovery: Automatically getting a comprehensive list of all monitored Kafka clusters
Data correlation: Linking Kafka broker metrics with Data Streams metrics for end-to-end observability
Multi-cluster environments: Better differentiation and filtering of metrics in environments with multiple Kafka clusters
This change is made possible by the dynamic tags functionality added in DataDog/jmxfetch#581, which allows us to dynamically fetch tag values from JMX beans and apply them to metrics at collection time.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.99%. Comparing base (d74af14) to head (c1c533a).
⚠️ Report is 10 commits behind head on master.

Additional details and impacted files

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