Bug #40559 assertion failed in check_binlog_magic

The reason of the bug is in that the test makes a trick with relay log files and
did not reset fully at the end.
If mtr does not restart the test the new SQL thread tried to work with the old time
session data.

Fixed with deploying RESET slave at the clean-up.

mysql-test/suite/binlog/t/binlog_auto_increment_bug33029.test:
  adding RESET slave to force active mi and rli data struct to be reset.
  The slave SQL thread will deal with a fresh structures each time it restarts.

mysql-test/suite/binlog/r/binlog_auto_increment_bug33029.result

@@ -38,4 +38,5 @@ DROP PROCEDURE IF EXISTS p2;
 DROP FUNCTION IF EXISTS f1;
 DROP TRIGGER IF EXISTS tr1;
 stop slave sql_thread;
+reset slave;
 SET @@global.relay_log_purge= @old_relay_log_purge;

mysql-test/suite/binlog/t/binlog_auto_increment_bug33029.test

@@ -52,9 +52,10 @@ DROP FUNCTION IF EXISTS f1;
 DROP TRIGGER IF EXISTS tr1;
 enable_warnings;
 
-remove_file $MYSQLD_DATADIR/slave-relay-bin.000001;
-remove_file $MYSQLD_DATADIR/slave-relay-bin.index;
 stop slave sql_thread;
+reset slave;
 source include/wait_for_slave_sql_to_stop.inc;
+remove_file $MYSQLD_DATADIR/slave-relay-bin.000001;
+remove_file $MYSQLD_DATADIR/slave-relay-bin.index;
 
 SET @@global.relay_log_purge= @old_relay_log_purge;