[Windows] Move Android and VS helpers to dedicated files (#8903)

images/windows/scripts/tests/Vsix.Tests.ps1

@@ -1,13 +1,13 @@
 Describe "Vsix" {
     $toolset = Get-ToolsetContent
-    $requiredVsixs = $toolset.visualStudio.vsix
+    $requiredVsixPackages = $toolset.visualStudio.vsix
 
     $allPackages = (Get-VisualStudioInstance).Packages
-    $testCases = $requiredVsixs | ForEach-Object {
-        $vsix = Get-VsixExtenstionFromMarketplace -ExtensionMarketPlaceName $_
+    $testCases = $requiredVsixPackages | ForEach-Object {
+        $vsixPackage = Get-VsixInfoFromMarketplace $_
         @{
-            VsixName = $vsix.ExtensionName
-            VsixId = $vsix.VsixId
+            VsixName    = $vsixPackage.ExtensionName
+            VsixId      = $vsixPackage.VsixId
             AllPackages = $allPackages
         }
     }
@@ -17,4 +17,4 @@ Describe "Vsix" {
             $objVsix | Should -Not -BeNullOrEmpty
         }
     }
-}
+}