Add subscribers action

.github/workflows/on-label.yml

@@ -11,7 +11,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           repository: 'microsoft/vscode-github-triage-actions'
-          ref: v34
+          ref: v35
           path: ./actions
       - name: Install Actions
         run: npm install --production --prefix ./actions
@@ -40,6 +40,13 @@ jobs:
           token: ${{secrets.VSCODE_ISSUE_TRIAGE_BOT_PAT}}
           config-path: commands
 
+      # only here.
+      - name: Run Subscribers
+        uses: ./actions/topic-subscribe
+        with:
+          appInsightsKey: ${{secrets.TRIAGE_ACTIONS_APP_INSIGHTS}}
+          token: ${{secrets.VSCODE_ISSUE_TRIAGE_BOT_PAT}}
+          config-path: subscribers
 
       # source of truth in ./feature-request.yml
       - name: Run Feature Request Manager