fix(k8s-gke): Fix deployment of minio storage for scylla-manager
fix(k8s-gke): Fix deployment of minio storage for scylla-manager

Remove explicit call of 'deploy_minio_s3_backend' method because
it is called implicitely as part of the recently updated
'deploy_scylla_manager' method.

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