The mentioned functionality is present in vOneCloud although it is hidden. It can be activated, but please bear in mind that this will be overwritten in future updates, and you will have to reinstate the configuration.
To bring up the snapshots and storage tabs in the Cloud View, please login in to the appliance:
And edit file /etc/one/sunstone-views/cloud.yaml, making the following changes:
Afterwards, you will need to restart the OpenNebula service in the Control Panel.