Improve WP-Cron robustness for Multisite environments about slickstack HOT 3 OPEN

And more related notes on WP-CLI and cron:

Ref: https://stackoverflow.com/questions/38766046/run-wp-cli-commands-with-cron-job
Ref: https://stackoverflow.com/questions/40452265/wp-cli-with-crontab
Ref: https://stackoverflow.com/questions/56782728/how-to-have-wp-cli-commands-work-in-a-bash-script-from-cron
Ref: https://support.pagely.com/hc/en-us/articles/360031050071-Managing-WordPress-Cron-Events-with-WP-CLI
Ref: https://wordpress.stackexchange.com/questions/278156/running-wp-cron-from-cli

Security notes:

Ref: https://wordpress.stackexchange.com/questions/176514/is-wp-cron-php-vulnerable-to-external-attacks-and-how-to-protect-it
Ref: https://wordpress.stackexchange.com/questions/384580/block-only-external-access-to-wp-cron-php-on-openlitespeed
Ref: https://stackoverflow.com/questions/25145836/allow-server-to-run-cron-jobs-but-block-access-to-normal-user-with-htacess

from slickstack.