AI Catalog feature tests - Update agents specs with improvements made in flows
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See comments in https://gitlab.com/gitlab-org/gitlab/-/merge_requests/218786.
When working on this issue, we should also look into these comments: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/227228#note_3157124755 and https://gitlab.com/gitlab-org/gitlab/-/merge_requests/227228#note_3157124839.
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