[KEP-5941] DRASharedConsumableCapacity documentation

[SchSeba]

Description

Add documentation for the DRA Shared Consumable Capacity alpha feature:

• Add DRASharedConsumableCapacity feature gate description
• Add "Shared consumable capacity" section to the DRA concepts page
  with SR-IOV bandwidth example showing requestPolicy on shared
  counters and valueFrom mappings on device counter consumption

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[SchSeba]

closing this one if favor of #56218