Use new Windows signature APIs from Microsoft.Security.Extensions package (#17159)

Co-authored-by: Anam Navied <anam.naviyou@gmail.com>
Co-authored-by: Travis Plunk <travis.plunk@microsoft.com>

test/powershell/engine/Security/FileSignature.Tests.ps1

@@ -0,0 +1,22 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+Describe "Windows platform file signatures" -Tags 'Feature' {
+
+    It "Verifies Get-AuthenticodeSignature returns correct signature for catalog signed file" -Skip:(!$IsWindows) {
+
+        if ($null -eq $env:windir) {
+            throw "Expected Windows platform environment path variable '%windir%' not available."
+        }
+
+        $filePath = Join-Path -Path $env:windir -ChildPath 'System32\ntdll.dll'
+        if (! (Test-Path -Path $filePath)) {
+            throw "Expected Windows PowerShell platform module path '$filePath' not found."
+        }
+
+        $signature = Get-AuthenticodeSignature -FilePath $filePath
+        $signature | Should -Not -BeNullOrEmpty
+        $signature.Status | Should -BeExactly 'Valid'
+        $signature.SignatureType | Should -BeExactly 'Catalog'
+    }
+}