[Windows] Split VSIX installation helper into two (#8872)

images/windows/scripts/build/Install-VSExtensions.ps1

@@ -14,7 +14,7 @@ $vsixPackagesList | ForEach-Object {
     # Retrieve cdn endpoint to avoid HTTP error 429 https://github.com/actions/runner-images/issues/3074
     $vsixPackage = Get-VsixExtenstionFromMarketplace -ExtensionMarketPlaceName $_
     if ($vsixPackage.FileName.EndsWith(".vsix")) {
-        Install-VsixExtension -Url $vsixPackage.DownloadUri -Name $vsixPackage.FileName
+        Install-VSIXFromUrl $vsixPackage.DownloadUri
     } else {
         Install-Binary `
             -Url $vsixPackage.DownloadUri `

images/windows/scripts/build/Install-WDK.ps1

@@ -30,7 +30,6 @@ Install-Binary -Type EXE `
     -ExpectedSignature $wdkSignatureThumbprint
 
 # Need to install the VSIX to get the build targets when running VSBuild
-$wdkExtensionPath = Resolve-Path -Path $wdkExtensionPath
-Install-VsixExtension -FilePath $wdkExtensionPath -Name "WDK.vsix" -InstallOnly
+Install-VSIXFromFile (Resolve-Path -Path $wdkExtensionPath)
 
 Invoke-PesterTests -TestFile "WDK"