MDEV-17108: Test failure on galera.galera_kill_ddl

Add suppression.

mysql-test/suite/galera/r/galera_kill_ddl.result

+call mtr.add_suppression("WSREP: Last Applied Action message in non-primary configuration from member .*");
 SET GLOBAL wsrep_provider_options = 'pc.ignore_sb=true';
 CREATE TABLE t1 (f1 INTEGER) ENGINE=InnoDB;
 Killing server ...

mysql-test/suite/galera/t/galera_kill_ddl.test

@@ -5,6 +5,8 @@
 --source include/galera_cluster.inc
 --source include/have_innodb.inc
 
+call mtr.add_suppression("WSREP: Last Applied Action message in non-primary configuration from member .*");
+
 --connection node_1
 
 # Enable the master to continue running during the split-brain situation that