use internal npm feed

.npmrc

@@ -1,4 +1,3 @@
 # Force public npm registry to avoid CI auth (E401) when no token is provided
-registry=https://registry.npmjs.org/
-# Do not require auth for public installs
-always-auth=false
+registry=https://devdiv.pkgs.visualstudio.com/_packaging/VS/nuget/v3/index.json
+

build/azure-devdiv-pipeline.pre-release.yml

@@ -66,30 +66,7 @@ extends:
                   artifactName: drop
                   sbomEnabled: true
             steps:
-              - task: npmAuthenticate@0
-                inputs:
-                  workingFile: .npmrc
-
-              - script: npm config get registry
-                displayName: Verify NPM Registry
-
-              - task: NodeTool@0
-                inputs:
-                  versionSpec: '22.17.0'
-                  checkLatest: true
-                displayName: Select Node 22 LTS
-
-              - task: PipAuthenticate@1
-                displayName: 'Pip Authenticate'
-                inputs:
-                  artifactFeeds: 'DevDiv/debugpy'
-
-              - task: UsePythonVersion@0
-                inputs:
-                  versionSpec: '3.9' # note Install Python dependencies step below relies on Python 3.9
-                  addToPath: true
-                  architecture: 'x64'
-                displayName: Select Python version
+              - template: build/templates/setup.yml@self
 
               - script: npm ci
                 displayName: Install NPM dependencies

build/azure-devdiv-pipeline.stable.yml

@@ -59,17 +59,7 @@ extends:
                   artifactName: drop
                   sbomEnabled: true
             steps:
-              - task: NodeTool@0
-                inputs:
-                  versionSpec: '22.17.0'
-                  checkLatest: true
-                displayName: Select Node 22 LTS
-              - task: UsePythonVersion@0
-                inputs:
-                  versionSpec: '3.9' # note Install Python dependencies step below relies on Python 3.9
-                  addToPath: true
-                  architecture: 'x64'
-                displayName: Select Python version
+              - template: build/templates/setup.yml@self
 
               - script: npm ci
                 displayName: Install NPM dependencies

build/templates/setup.yml

@@ -0,0 +1,26 @@
+# DevDiv pipeline setup steps (no parameters)
+steps:
+  - task: npmAuthenticate@0
+    inputs:
+      workingFile: .npmrc
+
+  - script: npm config get registry
+    displayName: Verify NPM Registry
+
+  - task: NodeTool@0
+    inputs:
+      versionSpec: '22.17.0'
+      checkLatest: true
+    displayName: Select Node 22 LTS
+
+  - task: PipAuthenticate@1
+    displayName: 'Pip Authenticate'
+    inputs:
+      artifactFeeds: 'DevDiv/debugpy'
+
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.9' # note Install Python dependencies step below relies on Python 3.9
+      addToPath: true
+      architecture: 'x64'
+    displayName: Select Python version