Merge pull request #12581 from smatvienko-tb/hotfix/device_subscriptions_remove_on_session_limit

core device actor: device subscriptions remove on session limit

application/src/main/java/org/thingsboard/server/actors/device/DeviceActorMessageProcessor.java

@@ -865,6 +865,8 @@ public class DeviceActorMessageProcessor extends AbstractContextAwareMsgProcesso
     }
 
     private void notifyTransportAboutClosedSessionMaxSessionsLimit(UUID sessionId, SessionInfoMetaData sessionMd) {
+        attributeSubscriptions.remove(sessionId);
+        rpcSubscriptions.remove(sessionId);
         notifyTransportAboutClosedSession(sessionId, sessionMd, TransportSessionCloseReason.MAX_CONCURRENT_SESSIONS_LIMIT_REACHED);
     }