Add step for OperatorGroup creation to airgap test pipeline

DS 3.0 installation failing in airgap environment on IBM Z. Seems the issue related to the error message "no operator group found". Can someone please provide any pointer regarding this failure?
Pipeline job: https://main-jenkins-csb-crwqe.apps.ocp-c1.prod.psi.redhat.com/job/Testing/job/Disconnected/job/installDS/44/

Solution:
https://github.com/redhat-developer/devspaces/blob/devspaces-3-rhel-8/product/installDevSpacesFromLatestIIB.sh#L262-L269

cat <<EOF | oc apply -f - 
apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: devspaces-operator
  namespace: ${NAMESPACE}
EOF
fi