[8.10] [OAS] Add defaultModel to generative AI connector (#166394)

[lcawl]

Backport

This will backport the following commits from main to 8.10:

• [OAS] Add defaultModel to generative AI connector (#166394)

Questions ?

Please refer to the Backport tool documentation

[github-actions]

Documentation preview:

• ✨ Changed pages

[apmmachine]

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[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: b396335

Failed CI Steps

• FTR Configs #36

Test Failures

• [job] [logs] FTR Configs #36 / machine learning - anomaly detection create jobs from lens "after each" hook for "can create a single metric job from vis with single layer"

Metrics [docs]

✅ unchanged

History

• 💔 Build #162445 failed 127a70d
• 💔 Build #161881 failed 25b2025
• 💔 Build #161301 failed 04abe6e
• 💔 Build #160943 failed 8b04afb
• 💔 Build #160535 failed c21913c

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@elasticmachine merge upstream