[Microsoft Azure Attestation Service] Adding June 2025 Public Microsoft Azure Attestation Data Plane API Version

[olkroshk]

Data Plane API Specification Update Pull Request

TDX VMs have been in preview since 2023. Currently, the TdxVm and AzureGuest attestation endpoints are available only through a 'preview' API version and need to be promoted to this new stable API version.

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Change Scope

• Added 2025-06-01 swagger definitions containing TdxVm and AzureGuest attestation types.
• Added corresponding examples related to the enabled attestation types.
• Updated specification/attestation/data-plane/readme.md

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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
Swagger	Microsoft.Attestation