Add Kubernetes C# provisioning emitter config

[ArcturusZhang]

Adds the C# provisioning emitter configuration for Azure.Provisioning.Kubernetes targeting Microsoft.Kubernetes 2025-12-01-preview, matching the current management SDK API version, and adds the RBAC role metadata required for the provisioning generator to emit KubernetesBuiltInRole and CreateRoleAssignment helpers.

Management SDK API review fixes are split into #43497.

Companion SDK PR: Azure/azure-sdk-for-net#59386

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API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
TypeSpec	Microsoft.Kubernetes
Go	sdk/resourcemanager/hybridkubernetes/armhybridkubernetes
JavaScript	@azure/arm-hybridkubernetes
Python	azure-mgmt-hybridkubernetes
C#	Azure.ResourceManager.Kubernetes
Java	com.azure.resourcemanager:azure-resourcemanager-hybridkubernetes

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