Fixes https://github.com/scylladb/scylladb/issues/13993 This commit applies feedback from @mykaul added in https://github.com/scylladb/scylladb/pull/13960 after it was merged. In addition, I've removed the information about the Ubuntu version the images are based - the info doesn't belong here, and, it addition, it causes maintenance issues. Closes #14703