Add assertion to build that PSES bits are built in release configuration

Because it's way too easier to break that! We were building in release
configuration, then running the tests...and the tests were then building
(and overwriting the bits) in debug configuration.

Author: andyleejordan

.vsts-ci/templates/ci-general.yml

@@ -70,6 +70,18 @@ steps:
     workingDirectory: $(Build.SourcesDirectory)/vscode-powershell
     pwsh: ${{ parameters.pwsh }}
 
+- task: PowerShell@2
+  displayName: Assert PowerShellEditorServices release configuration
+  inputs:
+    targetType: inline
+    script: |
+      $assembly = [Reflection.Assembly]::LoadFile("$(Build.SourcesDirectory)/vscode-powershell/modules/PowerShellEditorServices.VSCode/bin/Microsoft.PowerShell.EditorServices.VSCode.dll")
+      if ($assembly.GetCustomAttributes([System.Diagnostics.DebuggableAttribute], $true).IsJITOptimizerDisabled) {
+        Write-Host "##vso[task.LogIssue type=error;] PowerShell Editor Services bits were not built in release configuration!"
+      }
+    pwsh: ${{ parameters.pwsh }}
+    failOnStderr: true
+
 - publish: $(vsixPath)
   artifact: vscode-powershell-vsix-$(System.JobId)
   displayName: Publish extension artifact