Remove kubeadm.k8s.io/v1beta3 from kubeadm config templates

[VannTen]

What would you like to be added

• Remove the kubeadm_config_api_version everywhere (use v1beta4)
• Remove the v1beta3 templates for kubeadm config files

/good-first-issue
/help

Why is this needed

#11674 introduced support for v1beta4 config type from kubeadm.
We're now at v1.35 and v1beta4 is the only supported apiversion, so no need to have a v1beta3 branch.

[k8s-ci-robot]

@VannTen:
This request has been marked as suitable for new contributors.

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Details

In response to this:

What would you like to be added

• Remove the kubeadm_config_api_version everywhere (use v1beta4)
• Remove the v1beta3 templates for kubeadm config files

/good-first-issue
/help

Why is this needed

#11674 introduced support for v1beta4 config type from kubeadm.
We're now at v1.35 and v1beta4 is the only supported apiversion, so no need to have a v1beta3 branch.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[VannTen]

/remove-kind feature
/kind cleanup

[Srishti-j18]

/assign