cluster health check: extract as a standalone library

[smira]

Investigate the ways to do extract this code, how to make it depend only on Talos machinery, but not Talos itself.

Pain points: abstract ClusterInfo interface.

Why?

• reuse in CACPPT
• use in other projects: Upgrade Controller
• 3rd party integrations

Look into siderolabs/capi-utils, as it might have some related to the Cluster abstractions.