Vsix Tests have been created. Old files have been removed

images/win/scripts/Tests/Vsix.Tests.ps1

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+Describe "VsixTests" {
+    $toolset = Get-ToolsetContent
+    $requiredVsixs = $toolset.visualStudio.vsix
+
+    $allPackages = (Get-VSSetupInstance | Select-VsSetupInstance -Product *).Packages
+    $testCases = $requiredVsixs | ForEach-Object { @{ VsixId = $_.Id;  AllPackages = $allPackages }}
+
+    It "<VsixId>" -TestCases $testCases {
+        $objVsix = $AllPackages | Where-Object {$_.id -eq $VsixId } | Select-Object Id, Version
+        $objVsix | Should -Not -BeNullOrEmpty
+    }
+}