Remove hard-coded default model instances #269717
Description
We have quite some hard-coded "gpt-4.1" instances in our codebase
Should we have a central place where we define a default client side model? CAPI already gives us a default service side model.
Once we have a central place then gpt-4.1 should be changed with gpt-5-mini (since no SKU has gpt-4.1 as default any more and we want to move as many workloads from it as possible).
@roblourens I am starting with you, as I saw quite some code areas that you own. But if you think someone else should do the cleanup feel free to assign back to me and we can find the right person.
fyi @joaomoreno