[Security Solution] Auto-bundle AI Assistant API OpenAPI specs

[maximpn]

Addresses: #184428

Summary

This PR adds scripts for automatic bundling of AI Assistant API OpenAPI specs as a part of PR pipeline. Corresponding result bundles are automatically committed to the Assistant Common package x-pack/packages/kbn-elastic-assistant-common in the docs/openapi/ess/ and docs/openapi/serverless folders (similar to #186384).

[maximpn]

Hi @elastic/security-generative-ai,

Could you check validity of accessibility of your APIs in Serverless and ESS by checking added x-labels?

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)

[spong]

#188704 has been merged, so this should be good once conflicts are resolved. Apologies for the overlap with the x-labels changes -- I didn't realize you were working this effort so ended up tackling them with the API alignment changes. All API's are ess/serverless, so I think we're all good here. Thanks for working on the bundler and all the docs and details @maximpn, this was nice and easy to work through and update 🙂

[spong]

LGTM! Thanks @maximpn! 🙂

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: e9a43cd

Failed CI Steps

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
integrationAssistant	539	540	+1
securitySolution	5610	5611	+1
total			+2

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
@kbn/elastic-assistant-common	332	328	-4

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
securitySolution	20.4MB	20.4MB	+7.0B

Unknown metric groups

API count

id	before	after	diff
@kbn/elastic-assistant-common	358	354	-4

History

• 💚 Build #222889 succeeded bee0578bc4fb6d26c616efecba8bfa196298cb02
• 💔 Build #222864 failed d9ff562fd974cec52479dcaecf2d462c86345b96

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

cc @maximpn

[dplumlee]

Rule management changes lgtm!