Add Feature Settings, update GenAI settings

[lcawl]

Summary

Update https://www.elastic.co/docs/explore-analyze/ai-features/manage-access-to-ai-assistant to describe the differences between the existing GenAI Settings page and the new Feature Settings page. Refresh screenshots and all pages that refer to GenAI Settings for default model/connector configuration (since that's now moved to the other app).

Reviewer notes

• I left the "Requirements" for the new feature settings page commented out for now, since my local tests indicated it's not the same as for GenAI settings but trial and error wasn't successful. Needs follow-up with @sphilipse or @saikatsarkar056
• The main page updated is https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/6122/explore-analyze/ai-features/manage-access-to-ai-assistant
  The rest mentioned in Add Feature Settings, update GenAI settings #6122 (comment) are just pages that reference those settings.
• There were changes to the Serverless GenAI settings that seem to be unrelated to the new model management feature (e.g. token usage setting) so I've added minimal text about those too.

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

[github-actions]

🔍 Preview links for changed docs

• explore-analyze/ai-features/agent-builder/chat.md
• explore-analyze/ai-features/agent-builder/models.md
• explore-analyze/ai-features/manage-access-to-ai-assistant.md
• explore-analyze/workflows/steps/ai-steps.md
• solutions/security/ai/ai-assistant.md

[github-actions]

Vale Linting Results

Summary: 1 suggestion found

💡 Suggestions (1)

File	Line	Rule	Message
solutions/security/ai/ai-assistant.md	48	Elastic.WordChoice	Consider using 'deactivate, deselect, hide, turn off' instead of 'disable', unless the term is in the UI.

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[alaudazzi]

LGTM

[leemthompo]

LGTM2!

[saikatsarkar056]

@lcawl Will this new Feature Settings section serve as the main documentation page for the feature settings going forward, or is a dedicated page planned? I want to make sure we're linking to the right place from the Kibana UI.

[github-actions]

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[lcawl]

@lcawl Will this new Feature Settings section serve as the main documentation page for the feature settings going forward, or is a dedicated page planned? I want to make sure we're linking to the right place from the Kibana UI.

Yes, unless there are plans to change the Feature Settings significantly in the near future, I think it make sense to keep it here for now. I have a PR open to use this URL from the Feature Settings page here: elastic/kibana#265633

[benironside]

Looks great. Page level changes make sense individually, and together the IA is clear.