AI Catalog: Hide agent tools selection behind ai_catalog_agent_tools FF

What does this MR do and why?

AI Catalog: Hide agent tools selection behind ai_catalog_agent_tools FF

Introduce ai_catalog_agent_tools feature flag Behind :global_ai_catalog feature flag

References

FF roll out issue: #569043 (closed)

Screenshots or screen recordings

FF off	FF on

How to set up and validate locally

1. Enable the Feature Flag:

   Feature.enable(:global_ai_catalog)

2. Visit http://gdk.test:3000/explore/ai-catalog

3. Go to Agents > New Agent or Edit an existing agent

4. Verify that the tools selector does not display

5. Enable the Feature Flag:

   Feature.enable(:ai_catalog_agent_tools)

6. Verify that the tools selector in now available on the agent form

MR acceptance checklist

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Related to #568915 (closed)