chore: remove iatp mock install

.github/workflows/helm-checks.yaml

@@ -160,9 +160,6 @@ jobs:
     - name: Install chart and run tests (tx-data-provider)
       run: ct install --charts charts/tx-data-provider --target-branch ${{ github.event.repository.default_branch }}
 
-    - name: Install chart and run tests (iatpmock)
-      run: ct install --charts charts/iatpmock --target-branch ${{ github.event.repository.default_branch }} --helm-extra-set-args "--set image.repository=kind-registry:5000/iatp-mock --set image.tag=testing"
-
     - name: Install chart for shared services (umbrella)
       run: |
         helm install umbrella charts/umbrella -f charts/values-test-shared-services.yaml -f charts/values-test-iam-init-container.yaml \