Add to NCP global pull-secret ,registry and version

[rollandf]

Since now the registry and versions are aligned for most sub-components, having a global setup for registry, pullSecret, version can make it easier for customers.

Example:

 apiVersion: mellanox.com/v1alpha1
 kind: NicClusterPolicy
 metadata:
   name: nic-cluster-policy
 spec:
   general:
     repository: nvcr.io/nvidia/mellanox
     version: network-operator-v25.7.0
	 imagePullSecrets:
	 - ngc-nvstaging-secret
   secondaryNetwork:
     cniPlugins:
       image: plugins
     ipoib:
       image: ipoib-cni
     multus:
       image: multus-cni
     ipamPlugin:
       image: whereabouts
   nvIpam:
     image: nvidia-k8s-ipam
     enableWebhook: false