Fix polymorphic result issue for autorest.go

[JiaqiZhang-Dev]

resolved: #1697

[Copilot]

Pull Request Overview

This PR introduces common types for Azure resource management version 5, extending the autorest.go test suite for data protection services to support the latest API specifications. The changes primarily focus on adding new JSON schema definitions and corresponding Go models.

• Add comprehensive v5 common type definitions for Azure resource management including types, private links, network security perimeter, managed identity, and customer managed keys
• Extend data protection test coverage with complete client implementations and model definitions
• Add polymorphic result handling support for autorest.go to address compatibility issues

Reviewed Changes

Copilot reviewed 69 out of 74 changed files in this pull request and generated 5 comments.

File	Description
swagger/specification/common-types/resource-management/v5/*.json	New v5 schema definitions for Azure common types including resource management, private links, network security, and identity management
packages/autorest.go/test/dataprotection/armdataprotection/*.go	Complete Go SDK implementation for data protection services including clients, models, interfaces, and serialization helpers

[JiaqiZhang-Dev]

@microsoft-github-policy-service rerun

[JiaqiZhang-Dev]

/check-enforcer evaluate