Remove mysql_secure_installation.pl

mysql_secure_installation.pl appears to be some Windows version of mysql_secure_installation:

https://github.com/MariaDB/server/blob/mariadb-10.4.4/scripts/mysql_secure_installation.pl.in

https://github.com/MariaDB/server/blob/mariadb-10.4.4/scripts/CMakeLists.txt#L247

The documentation page for mysql_install_db.exe says that this mysql_secure_installation.pl script is now obselete:

mysql_install_db.exe is used by the MariaDB installer for Windows if the "Database instance" feature is selected. It obsoletes similar utilities and scripts that were used in the past such as mysqld.exe --install, mysql_install_db.pl, and mysql_secure_installation.pl.

https://mariadb.com/kb/en/library/mysql_install_dbexe/

Should we remove mysql_secure_installation.pl?