[OSSM-12848] Fix pilot/gatewayinstance subsuite when sail operator is used

[mkralik3]

Fix pilot/gatewayinstance when sail operator is used as external control plane installer
--istio.test.kube.controlPlaneInstaller=./prow/setup/sail-operator-setup.sh

The gatewayinstance:

• creates 2 different control planes (mesh and gateway) with different namespace as istio-system, so script must be updated to set correct namespace in sail-iop.yaml
• creates 2 different control planes (mesh and gateway) with different name as default, so script must be updated to set correct name in sail-iop.yaml
• mesh should have ingress/egress, gateway should not
  • since there are 2 control planes, the sidecar.istio.io/inject label/annotation must be changed to the istio.io/rev
• to correctly test ns boundaries, the discovery selector must be set in sail-iop.yaml

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