Check kyverno policies status in CI

What does this MR do and why?

Draft MR to open the discussion. this is a very small shell script that will find any PolicyReport or ClusterPolicyReport whith a status different from PASS or SKIP and log them into a file before exiting in error.

Output example (done on a dev env with an audit policy):

ClusterPolicyReport 700668da-69c8-4d96-94e4-8a757cc23ebb was in FAIL/WARN/ERROR
{
  "message": "All Namespaces must have a NetworkPolicy.",
  "policy": "namespace-needs-networkpolicy",
  "result": "fail",
  "rule": "namespace-needs-networkpolicy",
  "scored": true,
  "source": "kyverno",
  "timestamp": {
    "nanos": 0,
    "seconds": 1715089581
  }
}
ClusterPolicyReport 7e908588-d406-483e-8bff-1e70d831f814 was in FAIL/WARN/ERROR
{
  "message": "All Namespaces must have a NetworkPolicy.",
  "policy": "namespace-needs-networkpolicy",
  "result": "fail",
  "rule": "namespace-needs-networkpolicy",
  "scored": true,
  "source": "kyverno",
  "timestamp": {
    "nanos": 0,
    "seconds": 1715089582
  }
}
ClusterPolicyReport 83df0210-fc36-4714-b8df-31529334b8c5 was in FAIL/WARN/ERROR
{
  "message": "All Namespaces must have a NetworkPolicy.",
  "policy": "namespace-needs-networkpolicy",
  "result": "fail",
  "rule": "namespace-needs-networkpolicy",
  "scored": true,
  "source": "kyverno",
  "timestamp": {
    "nanos": 0,
    "seconds": 1715089582
  }
}

I also see that a tool, kyverno-reporter exist: https://kyverno.github.io/policy-reporter , https://github.com/kyverno/policy-reporter and provide a way to monitor the policies violation and display it via an UI and/or send notification via some exporter (slack, mail etc...)

I haven't test it but maybe it can be interesting for the monitoring and day to day operation?

Related reference(s)

close #1205 (closed)

Test coverage