Scheduler: update potentialVictims as framework.PodInfo type

[gavinfish]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Change potentialVictims in default preemption as framework.PodInfo type.

Which issue(s) this PR fixes:

Part of #97813

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.:

[k8s-ci-robot]

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[gavinfish]

/assign @ahg-g

[ahg-g]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahg-g, gavinfish

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