PreFilteringScaleDownNodeProcessor should exclude upcoming nodes from destination candidates

[MartynaGrotek]

What type of PR is this?

/kind bug

What this PR does / why we need it:

When CA considers scale-down, it should exclude from potential destinations upcoming nodes. We can't be sure that the upcoming node will start up. (eg. due to stock outs or any other reason)

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: MartynaGrotek (f408831)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: MartynaGrotek
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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @MartynaGrotek. Thanks for your PR.

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[x13n]

The code looks good, did you have a chance to test this scenario?

/lgtm