Orchestrate Sites CLI command generating a huge amount of implicit float conversion warnings on PHP >= 8.1

[cristianobaptista]

Desired Behavior

We would like to not have warnings in our logs about implicit float conversion on PHP >= 8.1.

Actual Behavior

The $num_groups variable in Automattic\WP\Cron_Control\CLI\Orchestrate_Sites::list() sometimes results in a float that is later used for the modulo operation at the end of the code block:

https://github.com/Automattic/vip-go-mu-plugins/blob/27bdb049240dbdee962ad3ff008581910043eb05/cron-control/includes/wp-cli/class-orchestrate-sites.php#L41-L54

Since $num_groups is not explicitly converted to an integer, our logs get completely clogged with warnings about this code.

[sjinks]

This is addressed in #400