Expose filteredNodes to func PriorityMetadataProducer

[Huang-Wei]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Due to some historical reason, some Priorities are not written in the map-reduce style, in particular PodAffinity and EvenPodsSpread. To make sure they can refactored into map-reduce style, their specific internal helper data structure must be calculated in PriorityMetadataProducer, and unfortunately current PriorityMetadataProducer signature doesn't expose the filteredNoded, which is needed for those 2 Priorities. This PR adds the additional filteredNoded in PriorityMetadataProducer.

Which issue(s) this PR fixes:

The migration of PodAffinity and EvenPodsSpread Priority is dependent on this.

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

/sig scheduling
/assign @ahg-g

[ahg-g]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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