Generate k8s api permissions docs

What does this MR do?

Generates the documentation table for RBAC requirements for Kubernetes. The mage target mage k8s:generatePermissionsDocs generates the doc and fails if there are undocumented coreV1() calls.

This is a first iteration, not great but very useful.

Why was this MR needed?

We constantly forged to document the API RBAC requirements, such as in #36961 (closed). This will at least force us to think about it.

What's the best way to test this MR?

Run mage k8s:generatePermissionsDocs inspect the output in docs/executors/kubernetes.md.

What are the relevant issue numbers?

Close #36961 (closed)