Istio CR modifications done by the Integration test suites are not reverted after tests are completed

[mluk-sap]

Description

Integration tests (v2alpha1 and ory) patch the Istio CR in order to include the external authorizer. This is not reverted after the tests are completed. It is not a good practice, which may cause end-developer confusion.

Expected result

Istio CR should be reverted to the original state (authorizer added by the test suite hook should be removed).

Actual result

Istio CR remains modified after tests are finished.

Steps to reproduce

kubectl apply -f https://github.com/kyma-project/istio/releases/download/1.9.0/istio-default-cr.yaml && make test-integration-v2alpha1 && kubectl get istio -n kyma-system -o yaml

It shows that the authorizer is there:

...
  spec:
    config:
      authorizers:
      - headers:
          inCheck:
            include:
            - x-ext-authz
        name: sample-ext-authz-http
        port: 8000
        service: ext-authz.ext-auth.svc.cluster.local
...