fix(k8s-eks): create SCT runner in rollingOperatorUpgradePipeline
fix(k8s-eks): create SCT runner in rollingOperatorUpgradePipeline

Current 'rollingOperatorUpgradePipeline' doesn't work with EKS just
because EKS backend expects that SCT runner exists and such step is just
absent and runner doesn't get created.
So, add such step to make it work for EKS.

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