cherry-pick least-nodes expander from #6792 into 1.30

[com6056]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Cherry-picks #6792 into the 1.30 release.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Added a new `least-nodes` expander

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

[k8s-ci-robot]

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[Shubham82]

/ok-to-test

[Shubham82]

Thanks @com6056
/lgtm

[x13n]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: com6056, x13n

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