Add missing documentation for node pools (health checks were not listed), reduce redundant parts of JSON schema for Karpenter vs. MachinePool types of node pools

[AndiDog]

What this PR does / why we need it

See giantswarm/schemadocs#159 – this PR contains the documentation generated with the new version of schemadocs. I've minified the needed JSON schema for the pool types in order to not create duplicates in documentation. For that purpose, I also added another Helm values test file to ensure all three values for $nodePool.type work fine (unset, machinepool, karpenter).

Checklist

• Updated CHANGELOG.md.

Trigger E2E tests

Later, let's first get this reviewed to ensure the schema is still correct.

[github-actions]

There were differences in the rendered Helm template, please check! ⚠️

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