Make GitLab Duo CLI work for instance-level model selection

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Description

At the moment GitLab Duo CLI doesn't work with GitLab managed models when instance-level model selection is enabled (self-hosted models are fine). The issue is that we are re-using enum definitions from FeaturesConfigurable which is meant for namespace-level settings and CLI is not included there because it doesn't work in a namespace context.

We need to implement a fix so that GitLab Duo CLI works with GitLab managed models (as well as self-hosted models) when instance-level model selection is enabled.

Slack context here

Screen_Recording_2025-10-29_at_2.59.41_pm

Definition of done:

• When a cloud-connected self-managed instance has instance-level model selection enabled, the user can select from both self-hosted and GitLab managed models for the GitLab Duo CLI feature setting.