Drop containerRuntimeEndpoint field from KubeletConfiguration

[xmudrii]

What this PR does / why we need it:

The containerRuntimeEndpoint field has been introduced in Kubernetes v1.27. This is causing the following error when running kubeadm init and kubeadm join on Kubernetes versions prior to 1.27:

[172.31.120.97] W1030 16:39:28.325293   11979 initconfiguration.go:305] error unmarshaling configuration schema.GroupVersionKind{Group:"kubelet.config.k8s.io", Version:"v1beta1", Kind:"KubeletConfiguration"}: strict decoding error: unknown field "containerRuntimeEndpoint"

Given that we don't use this field at this time, we can just drop it for now.

What type of PR is this?
/kind bug

Does this PR introduce a user-facing change? Then add your Release Note here:

Drop `containerRuntimeEndpoint` field from KubeletConfiguration to fix warning from `kubeadm init` and `kubeadm join` for clusters running Kubernetes prior to 1.27

Documentation:

NONE

/assign @kron4eg @ahmedwaleedmalik

[xmudrii]

/cherrypick release/v1.7

[kubermatic-bot]

@xmudrii: once the present PR merges, I will cherry-pick it on top of release/v1.7 in a new PR and assign it to you.

In response to this:

/cherrypick release/v1.7

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/test-infra repository.

[xmudrii]

/retest

[kron4eg]

/approve
/lgtm

[kubermatic-bot]

LGTM label has been added.

Git tree hash: 56eac97ad70edd899088e1a12522b44ab365d634

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kron4eg

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[kubermatic-bot]

@xmudrii: new pull request created: #2940

In response to this:

/cherrypick release/v1.7

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/test-infra repository.