make VS19ExtensionVersion function

images/win/scripts/Installers/Windows2019/Validate-WDK.ps1

@@ -3,28 +3,7 @@
 ##  Desc:  Validate the installation of the Windows Driver Kit
 ################################################################################
 
-function Get-WDKExtensionPackage {
-    $vsProgramData = Get-Item -Path "C:\ProgramData\Microsoft\VisualStudio\Packages\_Instances"
-    $instanceFolders = Get-ChildItem -Path $vsProgramData.FullName
-
-    if($instanceFolders -is [array])
-    {
-        Write-Host "More than one instance installed"
-        exit 1
-    }
-
-    $stateContent = Get-Content -Path ($instanceFolders.FullName + '\state.packages.json')
-    $state = $stateContent | ConvertFrom-Json
-    $WDKPackageVersion = ($state.packages | where { $_.id -eq "Microsoft.Windows.DriverKit" }).version
-
-    if (!$WDKPackageVersion)
-    {
-        Write-Host "WDK package for Visual studio was not found"
-        exit 1
-    }
-
-    return $WDKPackageVersion
-}
+Import-Module -Name ImageHelpers -Force
 
 function Get-WDKVersion
 {
@@ -40,7 +19,7 @@ function Get-WDKVersion
 }
 
 $WDKVersion = Get-WDKVersion
-$WDKPackageVersion = Get-WDKExtensionPackage
+$WDKPackageVersion = Get-VS19ExtensionVersion -packageName "Microsoft.Windows.DriverKit"
 
 # Adding description of the software to Markdown
 $SoftwareName = "Windows Driver Kit"