🌱 CAPD: add ClusterClass cluster-template

[sbueringer]

Signed-off-by: Stefan Büringer buringerst@vmware.com

What this PR does / why we need it:
More context in the issue.

Tested manually against a tilt-managed cluster (envsubst'ed cluster-template manually + kubectl apply)

Note: The KCPTemplate is only valid after #5788 has been merged.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #5730

[sbueringer]

Just moved this down as it's the more logical order and to make it easy to diff against (and thus keep in sync with) the ClusterClass

[sbueringer]

/assign @fabriziopandini

[fabriziopandini]

/lgtm
/approve
Before release, we should check ClusterClass documentation overall and make sure this template is documented somewhere (might be in the main quick start, so it is possible to drop the custom one under https://cluster-api.sigs.k8s.io/tasks/experimental-features/cluster-classes.html)

[k8s-ci-robot]

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