Add back publish events (sonic-net#20306)

### Why I did it

sonic-net#19179 removed call to publish_events when memory usage container exceeds threshold, causing test_events to fail.

### How I did it

Add back call to publish_events

#### How to verify it

Manual test

files/image_config/monit/memory_checker

@@ -219,6 +219,7 @@ def check_memory_usage(container_name, threshold_value):
     if total_memory_usage > threshold_value:
         print("[{}]: Memory usage ({} Bytes) is larger than the threshold ({} Bytes)!"
               .format(container_name, total_memory_usage, threshold_value))
+        publish_events(container_name, "{:.2f}".format(total_memory_usage), str(threshold_value))
         sys.exit(EXCEED_THRESHOLD)
 
 def is_service_active(service_name):