Just found out about this and because I maintain about dozens instances, the script below would be make the process less painfull.
sudo /opt/bitnami/ctlscript.sh stop mysql
sed -r 's/^(\[My|my)/\;\1/g' /opt/bitnami/properties.ini
sudo mv /opt/bitnami/mysql /opt/bitnami/mysql-disabled
Like @beltran mention, we could do
sudo rm -rf /opt/bitnami/mysql if sure about removing all the MySQL component