Wrap async event bus publish in ManagedContextRunnable for DB connection safety

The sole subscriber (ApiServer.handleAsyncJobPublishEvent) performs DAO reads
(getUserIncludingRemoved, getAccount, findById) inside its callback.
Without ManagedContextRunnable, the EventBus thread would not have proper
TransactionLegacy lifecycle management, risking DB connection leaks.

Author: sliceofapplepie

framework/jobs/src/main/java/org/apache/cloudstack/framework/jobs/impl/AsyncJobManagerImpl.java

@@ -1400,9 +1400,13 @@ protected AsyncJobManagerImpl() {
 
     private void publishOnEventBus(AsyncJob job, String jobEvent) {
         try {
-            _eventBusPublisher.submit(() ->
-                _messageBus.publish(null, AsyncJob.Topics.JOB_EVENT_PUBLISH, PublishScope.LOCAL,
-                    new Pair<AsyncJob, String>(job, jobEvent)));
+            _eventBusPublisher.submit(new ManagedContextRunnable() {
+                @Override
+                protected void runInContext() {
+                    _messageBus.publish(null, AsyncJob.Topics.JOB_EVENT_PUBLISH, PublishScope.LOCAL,
+                        new Pair<AsyncJob, String>(job, jobEvent));
+                }
+            });
         } catch (RejectedExecutionException e) {
             s_logger.warn("Failed to publish async job event, event bus publisher is shut down", e);
         }