Add minimum tests for policy-reporter UI

[viccuad]

From the fallout of kubewarden/helm-charts#311, it is obvious we need some minimum testing of the policy-reporter UI subchart.

Acceptance criteria

Test installation of the policy reporter subchart with auditScanner.policyReporter=true.

• Check that the kubewarden-controller-ui is up and running.
• Check that the services kubewarden-controller-ui and kubewarden-controller-policy-reporter are available.
• Perform a minimal smoke test (e.g: setting kubectl port-forward service/kubewarden-controller-ui 8082:8080 -n kubewarden and hitting the kubewarden-controller-ui in localhost:8082). Maybe there's better ways.

Repeat the test in upgrade scenarios, upgrading the policy-reporter chart bits too, by upgrading from an install with auditScanner.policyReporter=true .