Release Restricted AI Catalog Items feature

What does this MR do and why?

This MR releases the Restricted AI Catalog Items feature.

Draft until we decide to merge it.

References

• Restricted visibility - Iteration 1 (Restricted... (gitlab-org#22590 - closed)
• [FF] `ai_catalog_internal_visibility` -- Enable... (#603961 - closed)

MR acceptance checklist

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Related to #603961 (closed)