Add Azure DevOps NPM feed

Author: andyleejordan

.npmrc

@@ -1,2 +1,5 @@
 ; We use Dependabot to update our packages, so we want to add without a prefix
 save-exact=true
+; We download from a private feed during the release process
+registry=https://pkgs.dev.azure.com/powershell-rel/PowerShellEditorServices/_packaging/PSESFeed/npm/registry/
+always-auth=true

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

@@ -56,6 +56,10 @@ steps:
   inputs:
     version: 18.x
 
+- task: npmAuthenticate@0
+  inputs:
+    workingFile: $(Build.SourcesDirectory)/vscode-powershell/.npmrc
+
 # We don't just use installPSResources.ps1 because we haven't always cloned PowerShellEditorServices
 - task: PowerShell@2
   displayName: Build and package

.vsts-ci/templates/publish-markets.yml

@@ -5,6 +5,10 @@ steps:
   artifact: vscode-powershell
   displayName: Download signed artifacts
 
+- task: npmAuthenticate@0
+  inputs:
+    workingFile: .npmrc
+
 - pwsh: |
     npm ci --loglevel=error
     Import-Module $(Build.SourcesDirectory)/tools/VersionTools.psm1