Categorize GitLab Duo features

• Please check this box if this contribution uses AI-generated content (including content generated by GitLab Duo features) as outlined in the GitLab DCO & CLA. As a benefit of being a GitLab Community Contributor, you receive complimentary access to GitLab Duo.

What does this MR do and why?

This MR splits the GitLab Duo features into 3 categories with individual tables. It does this to achieve the following:

• Prevent confusion between chat, non-chat features
• Support upcoming additions like subfeatures

References

#526588

MR acceptance checklist

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