Removed SAS token for VHD downloads

[janegilring]

This pull request primarily focuses on changes made to the azure_jumpstart_arcbox/artifacts/ArcServersLogonScript.ps1 file. The changes is aimed at simplifying the way Azure's azcopy command is used to copy VHD files from a source folder. The changes remove the use of a Shared Access Signature (SAS) token and modify the $vhdSourceFolder variable to directly include the path to the VHD files.

Here are the key changes:

• azure_jumpstart_arcbox/artifacts/ArcServersLogonScript.ps1: The $vhdSourceFolder variable was modified to directly include the path to the VHD files, removing the need for the $sas variable. This change simplifies the URL used in the azcopy command.

• azure_jumpstart_arcbox/artifacts/ArcServersLogonScript.ps1: The azcopy command was updated to remove the $sas variable from the source URL. This change was made in the conditional block for the "DevOps" flavor.

• azure_jumpstart_arcbox/artifacts/ArcServersLogonScript.ps1: Similar to the previous change, the azcopy command was updated to remove the $sas variable from the source URL. This change was made in the conditional block for the "Full" flavor and other flavors.

Resolves #2551

[microsoft-github-policy-service[bot]]

Hi janegilring! Thank you for opening this Pull Request. Someone will review it soon. Thank you for committing to making the Azure Arc Jumpstart better.