[kafka_consumer] Add bootstrap_servers to heartbeat payload

[piochelepiotr]

Summary

• Include bootstrap_servers (from kafka_connect_str) in the cluster monitoring heartbeat payload sent by the Kafka consumer integration.

Test plan

• Verify heartbeat events now include the bootstrap_servers field.

🤖 Generated with Claude Code

[dd-octo-sts]

Validation Report

All 20 validations passed.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.02%. Comparing base (0c9882f) to head (50d639c).
⚠️ Report is 2 commits behind head on master.

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[datadog-datadog-prod-us1]

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 88.31% (+1.18%)

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