Create drush command to discover jobs

Doesn't apply anymore.

Re-rolled patch.

Tested and working ok, command is available and works without issues.

Conflicts on constructor changes that I had to commit for drush 13 compatibility.

That said, I also just committed 🐛 discover cron jobs on cache rebuild rather than module install? Fixed , so I'm not sure if this is still needed, you can just clear caches now.

Indeed, discovering when rebuilding the cache would be enough for our use case.

I have created a patch specific for 2.0alpha7 (not alpha8) to comply with PHP 8.2 and 8.3 since dynamic declarations of properties is deprecated in PHP8.2.