Ignore deleting worker nodes that are not in cluster

[HoKim98]

What type of PR is this?
/kind bug

What this PR does / why we need it:

There is a bug that remove-node.yml tries to remove the worker nodes that are actually not in the cluster and emits an error.

In fact, there have been several mechanisms to exclude 'ghost' nodes from deleting such as:

• nodes variable in https://github.com/kubernetes-sigs/kubespray/blob/master/roles/remove-node/pre-remove/tasks/main.yml#L18

However, this implementation was not applied in the post-remove process, and this caused the process to eventually crash.

• https://github.com/kubernetes-sigs/kubespray/blob/master/roles/remove-node/post-remove/tasks/main.yml

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

No more errors are emitted when attempting to delete worker nodes that do not exist.

[k8s-ci-robot]

Hi @kerryeon. Thanks for your PR.

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[floryut]

@kerryeon Thanks!
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, kerryeon

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[oomichi]

Nice work!

/lgtm