[HTTP/OAS] Add tags and summaries for saved object APIs

[lcawl]

Summary

Relates to #180056, #183935

This PR adds summaries and tags for saved object operations in the generated OpenAPI document.

How to test

Per #181277:

1. Start Elasticsearch (e.g. yarn es snapshot --license trial)
2. Add server.oas.enabled: true to kibana.dev.yml
3. Start Kibana (e.g. yarn start --no-base-path)
4. curl -s -uelastic http://localhost:5601/api/oas\?pathStartsWith\=/api/saved_objects | jq > test1.json
5. curl -s -uelastic http://localhost:5601/api/oas\?pathStartsWith\=/api/encrypted_saved_objects | jq > test2.json

The output will contain info like this:

  "paths": {
    "/api/saved_objects/{type}/{id}": {
      "get": {
        "summary": "Get a saved object",
        "tags": [
          "saved objects"
        ],

[apmmachine]

🤖 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!)

[jloleysens]

Great job @lcawl! Left a nit.

[kc13greiner]

Descriptions look good!

Just one question echoing JL's comment about routes switching to public

[lcawl]

I've split off the changes to the manually-maintained OpenAPI document in #186134 since this PR was getting overly large.

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 318caa3

Failed CI Steps

• FTR Configs #16

Test Failures

• [job] [logs] FTR Configs #16 / Cloud Security Posture Test adding Cloud Security Posture Integrations CNVM CNVM AWS Clicking on Launch CloudFormation on post intall modal should lead user to Cloud Formation page

Metrics [docs]

✅ unchanged

History

• 💔 Build #215599 failed 53e6905
• 💛 Build #214483 was flaky e0b21ac
• 💚 Build #214030 succeeded 3e45368
• 💔 Build #213894 failed 8042247
• 💔 Build #213759 failed 266fc0b

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

[jloleysens]

Thanks updating these endpoints with summaries and main changes.

---

I opened this issue to do the last step of including SO APIs in our generated bundle.

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 7931959

Failed CI Steps

Metrics [docs]

✅ unchanged

History

• 💛 Build #219917 was flaky 1a35ac2
• 💔 Build #219670 failed 78630b8

[kc13greiner]

LGTM!

[kibanamachine]

💚 All backports created successfully

Status	Branch	Result
✅	8.15

Note: Successful backport PRs will be merged automatically after passing CI.

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[kibanamachine]

Looks like this PR has a backport PR but it still hasn't been merged. Please merge it ASAP to keep the branches relatively in sync.