Remove patching of istio; update values for seccompvalue via chart

[MaxKavun]

Pull Request Template for Kubeflow manifests Issues

✏️ A brief description of the changes

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 #2528

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• Make sure you have tested with kustomize. See Installation Prerequisites
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[juliusvonkohout]

• Please add this as a proper patch, install.yaml is probably auto-generated via https://github.com/kubeflow/manifests/tree/master/hack istio scripts as documented in the readme https://github.com/kubeflow/manifests/blob/master/common/istio-cni-1-23/README.md.
• We also need to check whether the patches in https://github.com/kubeflow/manifests/tree/master/common/istio-cni-1-23/istio-install/base/patches are already enough or whether we can move it directly to the istio profile from which install.yaml is generated and remove the patches.
• We also need to check that it is up to date for both options(legacy,istio-cni).
  -We can also upgrade istio to 1.24.2 https://github.com/istio/istio/releases/tag/1.24.2 . with the script in /hack.

I am on my phone, so there might be small mistakes.