PS-10321 postfix: binlog-server fails to read the new events after upgrading server from 8.0 to 8.4

https://perconadev.atlassian.net/browse/PS-10321

Fixed 'binlog_streaming.data_directory_8_0_to_8_4_upgrade' MTR test case that
started to fail after 30 days since it was created. The problem turned out to be
connected with enabled automatic purging of binary log files (set to 30 days) that
started to happen upon MySQL Server restart during 8.0 -> 8.4 data directory
upgrade. Fixed by adding the
"--log-error=$MYSQLD_LOG --binlog_expire_logs_auto_purge=OFF" command
line option to the restart command.

Author: percona-ysorokin

mtr/binlog_streaming/t/data_directory_8_0_to_8_4_upgrade.test

@@ -42,7 +42,7 @@ if ($lts_series != v84)
 --echo *** Running 8.4 binaries on a 8.0 data directory
 --let $MYSQLD_LOG = $MYSQLTEST_VARDIR/log/upgrade.log
 --let $do_not_echo_parameters = 1
---let $restart_parameters = restart: --datadir=$CUSTOM_MYSQLD_DATADIR --log-error=$MYSQLD_LOG
+--let $restart_parameters = restart: --datadir=$CUSTOM_MYSQLD_DATADIR --log-error=$MYSQLD_LOG --binlog_expire_logs_auto_purge=OFF
 --source include/start_mysqld.inc
 
 --echo