Add response modifier to categorize questions
What does this MR do and why?
CategorizeQuestions class were not returning ResponseModifier object, hence were not processed properly here: https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/app/services/llm/internal/completion_service.rb#L72
By adding simple response modifier - basically class that implements errors method and returns an array, we can fix that.
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