[DOCS][OAS] Re-add case APIs

[lcawl]

Summary

This PR re-adds the case APIs that were accidentally omitted from the new API bundler.

[obltmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[elasticmachine]

Pinging @elastic/kibana-docs (Team:Docs)

[elasticmachine]

Pinging @elastic/response-ops-cases (Feature:Cases)

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 775a629

Failed CI Steps

• FTR Configs #34

Test Failures

• [job] [logs] FTR Configs #34 / Uptime app "after all" hook: afterTestSuite.trigger in "Uptime app"
• [job] [logs] FTR Configs #34 / Uptime app with generated data "after all" hook: afterTestSuite.trigger in "with generated data"
• [job] [logs] FTR Configs #34 / Uptime app with generated data uptime settings page "after all" hook: afterTestSuite.trigger for "changing certificate expiration threshold is reflected in settings page"
• [job] [logs] FTR Configs #34 / Uptime app with generated data uptime settings page "before each" hook: navigate to clean app root for "loads the default settings"

Metrics [docs]

✅ unchanged

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[kilfoyle]

LGTM! 🐁