MDEV-34477 galera.galera_gcache_recover_manytrx sporadic failures

The problem was in error message suppression, which did not match
the actual warning messages, due to bad quotations.
Changed warnings message suppressions to more simple format.
Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com>

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

@@ -94,7 +94,6 @@ CALL insert_1m ();;
 connection node_1_insert_10m;
 CALL insert_10m ();;
 connection node_2;
-call mtr.add_suppression("Error in Log_event::read_log_event\(\):.*");
 SET SESSION wsrep_sync_wait = 0;
 Killing server ...
 connection node_1;
@@ -131,9 +130,9 @@ DROP PROCEDURE update_simple;
 DROP PROCEDURE insert_1k;
 DROP PROCEDURE insert_1m;
 connection node_1;
-call mtr.add_suppression("Error in Log_event::read_log_event\(\):.*");
+call mtr.add_suppression("Error in Log_event::read_log_event\\(\\)");
 CALL mtr.add_suppression("conflict state 7 after post commit");
 CALL mtr.add_suppression("Skipped GCache ring buffer recovery");
 connection node_2;
-call mtr.add_suppression("Error in Log_event::read_log_event\(\):.*");
+call mtr.add_suppression("Error in Log_event::read_log_event\\(\\)");
 CALL mtr.add_suppression("Skipped GCache ring buffer recovery");

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

@@ -126,7 +126,6 @@ DELIMITER ;|
 --send CALL insert_10m ();
 
 --connection node_2
-call mtr.add_suppression("Error in Log_event::read_log_event\(\):.*");
 SET SESSION wsrep_sync_wait = 0;
 
 # Make sure that node_2 is not killed while TOIs are applied.
@@ -200,12 +199,12 @@ DROP PROCEDURE insert_1k;
 DROP PROCEDURE insert_1m;
 
 --connection node_1
-call mtr.add_suppression("Error in Log_event::read_log_event\(\):.*");
+call mtr.add_suppression("Error in Log_event::read_log_event\\(\\)");
 CALL mtr.add_suppression("conflict state 7 after post commit");
 
 # Warning happens when the cluster is started for the first time
 CALL mtr.add_suppression("Skipped GCache ring buffer recovery");
 
 --connection node_2
-call mtr.add_suppression("Error in Log_event::read_log_event\(\):.*");
+call mtr.add_suppression("Error in Log_event::read_log_event\\(\\)");
 CALL mtr.add_suppression("Skipped GCache ring buffer recovery");