Prepend Microsoft onto OperatingSystemInfo.Name object.

When grepping this data from the registry, it doesn't contain it unlike the old WMI code.

Author: mjr4077au

src/PSADT/PSADT/DeviceManagement/OperatingSystemInfo.cs

@@ -54,7 +54,7 @@ static bool IsOperatingSystemEnterpriseMultiSessionOS(OS_PRODUCT_TYPE productTyp
                     ubr = ubrValue;
                 }
                 DisplayVersion = (string?)key.GetValue("DisplayVersion");
-                productName = (string)key.GetValue("ProductName")!;
+                productName = $"Microsoft {(string)key.GetValue("ProductName")!}";
                 editionId = (string?)key.GetValue("EditionID");
             }