refactor: Remove code suggestion non-GitLab engine support
Remove code suggestion non-GitLab engine support as engines other than GitLab won't be supported
This is an iterative first support to simplify Code suggestion configuration (formerly AI Assist)
Main issue: https://gitlab.com/gitlab-org/modelops/applied-ml/ai-assist/ai-assist-api/-/issues/10
Screenshots
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Edited by Alper Akgun