Document and contextualise kube-bench results for KKP

We should look into publishing results for https://github.com/aquasecurity/kube-bench on a stock KKP user cluster to our docs. Some tests might also be false-negatives, so we need to document why we believe those are not valid, so users running kube-bench on their own can understand the results they are getting.

I think it would be best to store the results in some data format (e.g. JSON, maybe kube-bench supports that as output), enrich it with context and render it into a document nicely. That way, we might be able to update it nicely.

Start by running kube-bench against a stock KKP user cluster and inspect whether it supports JSON output. Identify the checks that produce false negatives, record the relevant context alongside the results, and render the collected data in the KKP documentation. Done means users can understand both the published results and why any reported failures are not valid.