Cherypick 1.28: Drop Node events when EC2 instance does not exist and node is not new

[mmerkes]

What type of PR is this? /kind bug

What this PR does / why we need it: See https://github.com/kubernetes/cloud-provider-aws/pull/753

Which issue(s) this PR fixes: N/A

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[cartermckinnon]

/lgtm /approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cartermckinnon

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