Add clone clearup to manager

Change-Id: I40362105fbd0c9a72c4211699e7b12d3d6c95229
diff --git a/server/agent/manager.go b/server/agent/manager.go
index ea7474d..db8f27c 100644
--- a/server/agent/manager.go
+++ b/server/agent/manager.go
@@ -167,5 +167,6 @@
 				slog.String("error", err.Error()))
 		}
 	}
-	return nil
+
+	return m.taskManager.Close()
 }