Refine test workflow notifications

Author: danischm

.github/workflows/test.yml

@@ -47,7 +47,7 @@ jobs:
         run: terraform validate -no-color
 
       - name: Webex Notification
-        if: always()
+        if: always() && github.event_name != 'pull_request'
         uses: qsnyder/action-wxt@master
         env:
           TOKEN: ${{ secrets.WEBEX_TOKEN }}