Allow Disabling Image Name Validation

[This check](https://github.com/intel/intel-device-plugins-for-kubernetes/blob/974c8e40bc24e3117f6bff35387c39823f9c2a7f/pkg/apis/deviceplugin/v1/webhook_common.go#L27) has the potential to break some workflows for mirroring images to private registries such as [kbld](https://carvel.dev/kbld).

It would be helpful to have an option to disable the image name validation since this it's only a sanity check and not a functional test.