Support OCI "modelcar" sidecars for model loading

Support OCI "modelcar" sidecars for model loading: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Today, when an InferenceService pod is admitted, model data is provisioned by an init container that copies the model from the configured storageUri into a shared…