Clean kubeadm-config cm from removed etcd nodes endPoints

[Alvaro-Campesino]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
This PR cleans the kubeadm-config configmap from information of etcd-nodes that are no longer present. This avoids issues when trying to rejoining this nodes

Which issue(s) this PR fixes:

Fixes #8235

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Cleanup kubeadm-config cm by removing etcd nodes endPoints no longer valid

[k8s-ci-robot]

Hi @Alvaro-Campesino. Thanks for your PR.

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[Alvaro-Campesino]

Ubuntu20 file download failed in the Molecule_test.

https://gitlab.com/kargo-ci/kubernetes-sigs-kubespray/-/jobs/1829080591#L2207

Doesn't seem relatedo the the PR contents.

[Alvaro-Campesino]

Hi,
CI/CD failed because the pulls limits for docker was reached, except for packet_fedora35 that was a not found error

Could you please review the docker account and the status of the failed download and relaunch the tests?

Best regards

[floryut]

/ok-to-test
/cc @oomichi @cristicalin @EppO

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Alvaro-Campesino, floryut

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[cristicalin]

Thank you @Alvaro-Campesino for this fix!

/lgtm

[floryut]

Removing it from the release-note (and reverting it) while we address the errors raised in issues