fix(k8s-eks-upgrade): calculate latest available sstable format
fix(k8s-eks-upgrade): calculate latest available sstable format

Right now we use hardcoded 'mc' version running scylla upgrade
on K8S. But now we have "md" as latest and it causes upgrade to fail.
So, fix it by adding lost call of
'get_highest_supported_sstable_version' method.

scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests