Add CEL Validation when HTTPRoute for InferencePool BackendRef when the Port is set #3924
Description
What happened:
Add CEL validation for HTTPRoute.BackendRef.Port is set and an InferencePool is targeted to catch case mentioned in discussion here
What you expected to happen:
The validation should catch the scenario discussed here
How to reproduce it (as minimally and precisely as possible):
Following the docs for inference gateway: https://gateway-api-inference-extension.sigs.k8s.io/ with Port set in HttpRoute succeeds.
Anything else we need to know?: