ci: fix dashboard-angular frontend tests + improve other tests

[thesuperzapper]

This PR fixes the "CentralDashboard-Angular Frontend Tests" tests from failing, it was because of two reasons:

1. it was trying to build the conntainer images for all archicetures:
   • fixed by always only doing make docker-build for intergration tests (only use make docker-build-multi-arch for actual docker build tests)
   • this change also allows us to remove ARCH envs from intergration test GitHub workflows
2. this test runs a kubeflow noteobok, and because we now use the kubeflow-pss overlay by default for profile-controller, it was enforcing pod-security.kubernetes.io/enforce=baseline in the profile namespaces, which is not compatible with istio in non-CNI mode:
   • fixed by always installing istio in CNI mode in tests, and updating to istio 1.29.1

[thesuperzapper]

/hold

I will drop 9410622 before we merge.

[thesuperzapper]

Ok, tests passed, should be good to merge once the small number of ones that trigger with the actual diff pass.

/ok-to-test
/approve

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[thesuperzapper]

/unhold

[christian-heusel]

How can we make sure that this stays updated? 🤔

[thesuperzapper]

I am not sure it matters, its just a dependency for that specific test, if the roles change hopefully we would notice when we tried to pull the manfiests into the manfiests repo. (Which is not even happening on the unreleased dashboard-angular rewrite).