[8.15] [DOCS][OAS] Add Fleet APIs (#190571)

[lcawl]

Backport

This will backport the following commits from main to 8.15:

• [DOCS][OAS] Add Fleet APIs (#190571)

Questions ?

Please refer to the Backport tool documentation

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[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!)

[kilfoyle]

LGTM! 🚢

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 3b48ba8

Metrics [docs]

✅ unchanged

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