Add Config Setting to turn off ssl for database backups

[LinneaHarts]

After upgrading a server's Debian we found that the mariadb CLI now uses TLS by default. We don't use TLS connections to our databases, relying on other encryption, and found that the default mysqldump command tries to use TLS. Changing these settings https://github.com/craftcms/cms/pull/12612/files to prevent the database from attempting to find a certificate didn't work. Instead I am overriding the backupCommand in config/general.php to have the --ssl=0 flag.

However, this seems fragile, since if Craft changes other aspects of the default mysqldump command in future upgrades, I'll have to change them in the backupCommand override.

My request is to add a config setting that just sets --ssl-0 for the backup command.