feat :Add GetActivePods to handle/datastore and remove deleted pod from prefix-cache scorer

[kfirtoledo]

This PR introduces two main enhancements:

1. GetActivePods support in the plugin handle and datastore

• Added GetActivePods() method to plugins.Handle interface.
• Updated eppHandle to store and call a GetActivePodsFunc.
• Implemented GetActivePods in the datastore to return the list of currently active pods.

2. Remove deleted pod from prefix-cache scorer

• Added RemovePod method to prefix.indexer to remove a pod
• This enables cleanup of deleted pod after period of time that pod becomes inactive.

These changes allow plugins to query active pods directly from the handle and support cache cleanup for inactive pods in the prefix-cache scorer (Fix #1289)

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[k8s-ci-robot]

Hi @kfirtoledo. Thanks for your PR.

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[kfirtoledo]

/assign @nirrozenbaum

[kfirtoledo]

/hold

[ahg-g]

@elevran is this aligned with the new datalayer APIs?

[elevran]

@elevran is this aligned with the new datalayer APIs?

I don't see a conflict - the datastore API is minimally affected.
Might be cleaner to allow registration for cleanup or Pod deletion instead of listing all Pods periodically, but this is not something I've touched in the data layer yet (plan to refactor the k8s data sources as well, as we discussed on the original design issue).

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kfirtoledo
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[liu-cong]

/lgtm

[liu-cong]

/ok-to-test

[liu-cong]

/lgtm