Add back TeamName variable

.azure-pipelines/1esmain.yml

@@ -30,6 +30,11 @@ parameters:
     type: boolean
     default: true
 
+variables:
+  # Required by MicroBuild template
+  - name: TeamName
+    value: "Azure Tools for VS Code"
+
 # Use those templates
 extends:
   template: azure-pipelines/1esmain.yml@azExtTemplates