KEP-5517: Update KEP to reflect alpha implementation

[pravk03]

• One-line PR description: Update KEP to reflect alpha implementation.

• Issue link: DRA: Native Resource Requests #5517

• Other comments:
  • Rename "Native Resources" to "Node Allocatable Resources" throughout the KEP.
  • Remove the ManagesNativeResources field from DeviceClassSpec in the main proposal.
  • Update NodeAllocatableResourceClaimStatus to use a map for resources.
  • Update NodeAllocatableResourceMapping to use CapacityKey and AllocationMultiplier.
  • Update the Kube-Scheduler Workflow to accurately describe PreFilter and Filter stages.

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[pravk03]

/assign @johnbelamaric @liggitt

[pravk03]

/retest

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Test name	Commit	Details	Required	Rerun command
pull-enhancements-verify	213643b	link	true	/test pull-enhancements-verify

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[liggitt]

@soltysh does the TOC diff presubmit changes in #5890 not handle renames of the folder? It looks like it is looking for the old directory name which no longer exists in this PR:

2026/04/11 21:48:15 get toc: unable to read keps/sig-scheduling/5517-dra-native-resources/README.md: open keps/sig-scheduling/5517-dra-native-resources/README.md: no such file or directory

[liggitt]

updates for the KEP to match the implementation lgtm

[soltysh]

@soltysh does the TOC diff presubmit changes in #5890 not handle renames of the folder? It looks like it is looking for the old directory name which no longer exists in this PR:

This should be addressed that in #6014. Sorry about that.