istio-cni by default

[juliusvonkohout]

• Istio-CNI as default
• We should use the new "Values.gateways.seccompProfile" and securitycontext to get rid of the manual patch at

  manifests/.github/workflows/pss_test.yaml

  Lines 35 to 45 in 26d970d

  	- name: Configure istio init container with seccompProfile attribute
  	run: |
  	kubectl get cm istio-sidecar-injector -n istio-system -o yaml > temporary_patch.yaml
  	sed -i '0,/runAsNonRoot: true/{s//&\n seccompProfile:\n type: RuntimeDefault/}' temporary_patch.yaml
  	sed -i '/runAsNonRoot: true/{N; /runAsUser: {{ .ProxyUID | default "1337" }}/a\
  	seccompProfile:\n type: RuntimeDefault
  	}' temporary_patch.yaml
  	kubectl apply -f temporary_patch.yaml
  	rm temporary_patch.yaml

  both for istio and istio-cni, so it is related to Rootless Kubeflow #2528
• We also need to add a comment about kserve with istio-cni and migrate https://github.com/kubeflow/manifests/blob/35298e042850e22a929ebdbcae94c225d69e33f8/.github/workflows/kserve_m2m_test.yaml to use a proper user namespace

@tarekabouzeid @kimwnasptd @DnPlas @kromanow94

[google-oss-prow]

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[juliusvonkohout]

@hansinikarunarathne can you take a look at the ray tests?