KEP-4049: Add StorageCapacityScoring feature gate documents

[cupnes]

Description

This PR updates existing documentation to include the addition of the StorageCapacityScoring feature gate of KEP-4049 as an alpha version.

Issue

• Add storage capacity scoring enhancements#4049

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[cupnes]

@sftim @ahg-g @salaxander @natalisucks
I have addressed your comments and believe the work on the document is complete. Please review it. If anything is missing, let me know and I will fix it.

[tengqm]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 48c2dd8d0eecfe460a810e7541e580d327e5ba19

[cupnes]

The alpha of KEP-4049 will skip version 1.32 (Ref). Therefore, I will close this PR that was opened against the dev-1.32 branch of the k/website repository.