Introduce ai_catalog_unified_views feature flag

Florie Guibertrequested to merge
627836-intrduce-ff-ai_catalog_unified_views into master

What does this MR do and why?

Introduce ai_catalog_unified_views feature flag

For AI catalog redesign

References

Redesign Epic: gitlab-org#23061

Screenshots or screen recordings

No visual changes

How to set up and validate locally

No functional changes, this only introduces a new feature flag

MR acceptance checklist

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Related to #627836

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