Allow for model to be selected by end user.

[m49808]

Similar to the experience in the AI Studio, with things like GPT-4.5 Turbo available in preview, would be great for this not to be set in the configuration but (optionally) customizable by the end user.

AZURE_OPENAI_MODEL
AZURE_OPENAI_MODEL_NAME

at a minimum so we can "publish" a preview model and allow users to test it via a drop-down. Otherwise i have to deploy a completely independent application just to try to test it out. Or expose the AI Studio which has other potential complications (too much flexibility, not user friendly)

[github-actions]

This issue is stale because it has been open for 30 days with no activity.