ci(docs-infra): re-enable aio_monitoring CircleCI job (#30110)

The job started failing for https://angular.io/, due to changes in tests
that only affected https://next.angular.io/, and was disabled in #30102.

This commit re-enables the job (since it does not block anything and it
will be fixed in a subsequent commit).

PR Close #30110

.circleci/config.yml

@@ -601,6 +601,17 @@ workflows:
             branches:
               only:
                 - master
+  aio_monitoring:
+    jobs:
+      - aio_monitoring
+    triggers:
+      - schedule:
+          # Runs AIO monitoring job at 00:00AM every day.
+          cron: "0 0 * * *"
+          filters:
+            branches:
+              only:
+                - master
 
 # TODO:
 # - don't build the g3 branch