KEP-5925: enhanced storage capacity tracking

[bachmanity1]

• One-line PR description: Enhance storage capacity tracking to support pods with multiple PVCs and enable storage-aware pod rescheduling.

• Issue link: Enhanced Storage Capacity Tracking #5925

• Other comments:

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @bachmanity1. Thanks for your PR.

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[bachmanity1]

Hi @xing-yang @msau42 @pohly @jsafrane, could you please review this?