Enable publishExtension in stable release pipeline

Set publishExtension parameter default to true so stable
releases publish the extension automatically.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: bschnurr

build/azure-devdiv-pipeline.stable.yml

@@ -28,7 +28,7 @@ parameters:
   - name: publishExtension
     displayName: 🚀 Publish Extension
     type: boolean
-    default: false
+    default: true
 
   - name: buildPlatforms
     type: object