Clean-up ai_model_switching from business logic

What does this MR do and why?

Related to #526307 clean-up ai_model_switching feature flag from business logic. This Feature is massive. This is just the first part of it's clean up proccess.

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.