[Compute] Introduced SecureVMGuestStateSAS switch parameter in Grant-AzSnapshotAccess

[haagha]

…tAccessMethod.cs` for optional VM guest state SAS.

Description

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

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• SHOULD update ChangeLog.md file(s) appropriately
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    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
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[Copilot]

Pull Request Overview

This PR introduces support for retrieving VM guest state SAS tokens when granting access to snapshots, adding the SecureVMGuestStateSAS switch parameter to the Grant-AzSnapshotAccess cmdlet.

• Added SecureVMGuestStateSAS switch parameter to enable VM guest state SAS retrieval
• Updated help documentation to describe the new parameter
• Updated changelog to document the API enhancement

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/Compute/Compute/help/Grant-AzSnapshotAccess.md	Added documentation for the new SecureVMGuestStateSAS switch parameter and updated command syntax
src/Compute/Compute/ChangeLog.md	Updated changelog to document the new functionality for Grant-AzSnapshotAccess