Customize Kubernetes C# management SDK API

[ArcturusZhang]

Applies C# management SDK API review customizations for Azure.ResourceManager.Kubernetes only.

Changes:

• Pins the C# management emitter to 2025-12-01-preview, matching the current management SDK API version.
• Adds C# @@clientName customizations for contextual ConnectedCluster* and ClusterUserCredential* model/enum names.
• Renames the cluster credential action payload to GetClusterUserCredentialContent and its operation parameter to content.
• Adds C# @@clientName customizations for acronym casing and boolean/timestamp property names.
• Adds a C# @@alternateType customization so privateLinkScopeResourceId emits as ResourceIdentifier.

Companion SDK PR: Azure/azure-sdk-for-net#59432

[github-actions]

Next Steps to Merge

Next steps that must be taken to merge this PR:

• ❌ Your PR has breaking changes in the generated SDK for Go (label: BreakingChange-Go-Sdk). Refer to step 3 in the PR workflow diagram.
• ❌ Your PR has breaking changes in the generated SDK for JavaScript (label: BreakingChange-JavaScript-Sdk). Refer to step 3 in the PR workflow diagram.
• ❌ Your PR has breaking changes in the generated SDK for Python (label: BreakingChange-Python-Sdk). Refer to step 3 in the PR workflow diagram.
• ❌ The required check named TypeSpec Validation has failed. Refer to the check in the PR's 'Checks' tab for details on how to fix it and consult the aka.ms/ci-fix guide

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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
C#	Azure.ResourceManager.Kubernetes
Python	azure-mgmt-hybridkubernetes
Java	com.azure.resourcemanager:azure-resourcemanager-hybridkubernetes

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