[release-0.6] Avoid unnecessary preemptions when candidates have the same timestamp

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #1875

/assign alculquicondor

Avoid unnecessary preemptions when there are multiple candidates for preemption with the same admission timestamp

[alculquicondor]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 92704609fb421457e8073983de033c04bc851aea

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[alculquicondor]

/kind bug