MDEV-24167: Stabilize perfschema.sxlock_func

The extension of the test perfschema.sxlock_func in
commit 1669c889
turned out to be unstable.

Let us filter out purge_sys.latch (trx_purge_latch) from the output,
because it might happen that the purge tasks will not be executed
during the test execution.

mysql-test/suite/perfschema/r/sxlock_func.result

@@ -32,12 +32,13 @@ commit;
 drop table t1;
 SELECT DISTINCT event_name FROM performance_schema.events_waits_history_long
 WHERE event_name LIKE 'wait/synch/rwlock/innodb/%'
-AND event_name!='wait/synch/rwlock/innodb/btr_search_latch'
+AND event_name NOT IN
+('wait/synch/rwlock/innodb/btr_search_latch',
+'wait/synch/rwlock/innodb/trx_purge_latch')
 ORDER BY event_name;
 event_name
 wait/synch/rwlock/innodb/dict_operation_lock
 wait/synch/rwlock/innodb/fil_space_latch
-wait/synch/rwlock/innodb/trx_purge_latch
 select operation from performance_schema.events_waits_history_long
 where event_name like "wait/synch/sxlock/%"
   and operation = "shared_lock" limit 1;

mysql-test/suite/perfschema/t/sxlock_func.test

@@ -45,7 +45,9 @@ drop table t1;
 
 SELECT DISTINCT event_name FROM performance_schema.events_waits_history_long
 WHERE event_name LIKE 'wait/synch/rwlock/innodb/%'
-AND event_name!='wait/synch/rwlock/innodb/btr_search_latch'
+AND event_name NOT IN
+('wait/synch/rwlock/innodb/btr_search_latch',
+ 'wait/synch/rwlock/innodb/trx_purge_latch')
 ORDER BY event_name;
 
 # Make sure some shared_lock operations have been executed