docs(DOC-2012): mirror Kafka Compatibility frontmatter on cloud stub

[Feediver1]

Summary

Companion to redpanda-data/docs#1614. Resolves DOC-2012 on the cloud side.

The docs-side page (docs/modules/develop/pages/kafka-clients.adoc) added page-topic-type, personas, and two learning objectives in the frontmatter so the page carries proper metadata in the streaming component. The cloud stub cloud-docs/modules/develop/pages/kafka-clients.adoc includes the body via include::streaming:develop:kafka-clients.adoc[tag=single-source] but Antora does not inherit frontmatter through a single-source include — it has to live in the stub.

This PR mirrors the same four attributes on the cloud stub so the page renders with consistent metadata under /cloud-data-platform/.

This is the Pattern B fix @micheleRP recommended: leave the docs-side header as-is, duplicate the frontmatter on the cloud stub. Reference stubs that follow the same pattern: schema-reg-contexts.adoc, manage-throughput.adoc.

Preview pages

• Kafka Compatibility (cloud)

Test plan

• Netlify preview builds without errors
• Page renders the new metadata (topic type, persona, learning objectives) at /cloud-data-platform/develop/kafka-clients/
• Body content (Kafka 4.x scope, KIP-890 bullet, terminology fixes) is unchanged — it still comes from the docs single-source include

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📝 Walkthrough

Walkthrough

This PR adds AsciiDoc metadata attributes to the Kafka clients documentation page. Four metadata lines are inserted into the page header: :page-topic-type: for topic classification, :personas: for target audience, and two :learning-objective-*: entries that describe learning outcomes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested reviewers

• paulohtb6

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: mirroring Kafka Compatibility frontmatter metadata onto the cloud documentation stub, directly matching the changeset's purpose.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description is comprehensive and well-structured, covering the purpose, approach, preview links, and test plan.

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch doc-2012-kafka4x-metadata-parity

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[micheleRP]

lgtm!