Draft: Migrate kubeSOS documentation from handbook & macros

Hi @vstoianovici 👋 Is this 1st change correct?

I'm also planning to check

• https://about.gitlab.com/handbook/support/workflows/troubleshooting_kubernetes.html
• https://gitlab.com/gitlab-com/support/support-ops/zendesk-macros/-/blob/master/macros/active/Support/Self-Managed/kubeSOS.yaml

and aggregate the most important details here, if you agree.

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Similar, previous example for this approach: gitlabrb_sanitizer!4 (merged)