[release-0.9] Fix preemption.findCandidates for Hierarchical Cohorts

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #3691

/assign gabesaba

Fix preemption when using Hierarchical Cohorts by considering as preemption candidates workloads
from ClusterQueues located further in the hierarchy tree than direct siblings.

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[gabesaba]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 7d76d632858d05899be9801c0d67682d382d86a2

[mimowo]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: k8s-infra-cherrypick-robot, mimowo

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[mimowo]

/kind bug