Adding support for Ultra and ZRS disk

[singhabh27]

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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[Copilot]

Pull Request Overview

This PR adds support for additional Azure disk types by expanding the available disk storage options in the Azure Migrate PowerShell module. It specifically adds support for Ultra SSD, Standard SSD ZRS (Zone Redundant Storage), and Premium ZRS disk types.

• Expands ValidateSet and ArgumentCompleter to include three new disk types: UltraSSD_LRS, StandardSSD_ZRS, and Premium_ZRS
• Updates the disk type validation dictionary to include mappings for the new disk types
• Enhances OS disk validation logic to prevent UltraSSD_LRS from being used as an OS disk (similar to existing PremiumV2_LRS restriction)

[YanaXu]

/azp run azure-powershell - security-tools

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