AVD Add-on: Convert scaling script to use API calls

[jamasten]

Benefit/Result/Outcome

PowerShell module differences are causing issues running the script across all clouds. Using API calls, will hardcode the API version / features, preventing issues with feature updates.

Description

Replace AZ cmdlets with API calls to reduce the dependency on specific AZ module versions.

Acceptance Criteria

• Replace AZ cmdlets with API calls
• Test the script for errors