🐛 Convert CAPI resources in generic Lists

[immanuwell]

What this PR does / why we need it:

clusterctl convert treated a generic v1/List as one non CAPI object. CAPI resources under items stayed on v1beta1

This sends List items through the existing converter and keeps the List wrapper and metadata

Repro:

kubectl get clusters,machines -A -o yaml | clusterctl convert

Before this reports Converted 0 resource(s). Now nested resources are converted and counted

Which issue(s) this PR fixes:

None. Related to #12716.

/area clusterctl

[kubernetes-prow]

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[kubernetes-prow]

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