Update examples & code snippets in Cluster API book to v1beta2

[sbueringer]

Hey folks,

we are currently in the process of bumping all our APIs (core CAPI, CABPK, KCP & CAPD) to v1beta2.

Accordingly we have to update our examples & code snippets in the Cluster API book.

We should bump the apiVersions used but we also have to adjust the objects accordingly (e.g. if a field was renamed).

This should be done according to the latest state of our CRDs on main.

All cases can be found by searching for "cluster.x-k8s.io/v1beta1" in docs/book/src

I think it makes sense to split it up as follows:

• PR for Cluster
• PR for ClusterClass
• PR for everything else

[sbueringer]

/help
/area documentation

[k8s-ci-robot]

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