When using the OCP installer to create a Nutanix OCP cluster using the preloaded rhcos image by setting the platform.nutanix.preloadedOSImageName field in the install-config.yaml, the installer should associate the preloaded rhcos image object with the cluster's shared category in the Prism Central. And when the OCP cluster is detroyed, the corresponding shared category of the cluster should also be removed from the preloaded rhcos image object from Prism Central.