Dualstack jobs beyond 4.13 (presumably when we added cluster-data.json) are miscategorized as NetworkStack = ipv4 because the code doesn't know how to detect dualstack: https://github.com/openshift/origin/blob/11f7ac3e64e6ee719558fc18d753d4ce1303d815/pkg/monitortestlibrary/platformidentification/types.go#L88

We have the ability to NOT override a variant calculated from jobname if cluster-data disagrees: https://github.com/openshift/sippy/blob/master/pkg/variantregistry/ocp.go#L181

We should fix origin, but we don't want to backport to five releases, so we should also update the variant registry to ignore this field in cluster data is release <= 4.18 (assuming that's where we fix this)