Follow-up: Add missing REST API ai_settings support and documentation
The following discussion from !233914 should be addressed: - [ ] @.luke started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/233914#note_3333308256): > Self-review thought: We don't have any REST API documentation for any of the existing settings that are part of the nested `ai_settings_attributes` settings here - this is probably an oversight that we should fix. The group API response is also absent of these settings - I think we should address both of these things in a follow-up MR.
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