[InferenceModel update] move modelName rewrite to be based on header

[kfswain]

Related to: https://github.com/kubernetes-sigs/gateway-api-inference-extension/tree/main/docs/proposals/1199-inferencemodel-api-evolution#structure-change

We will add a flag for modelName rewrite and base usage on that flag, rather than relying on inferendeModel.

[zhengkezhou1]

Hi @kfswain, is this a work in progress? If not, I would be happy to help out.

[kfswain]

Heya @zhengkezhou1 it is, I'll have more time to wrap this up today. (Not tagging as WIP so I can keep tests running as I can work)

[zhengkezhou1]

got it. I was just wondering if there are any other issues I can take on?

[kfswain]

Yes! Absolutely! Give me some time and I'll tag you in some issues.

[kfswain]

Fixed by: #1307