Add an option in mode 2 to limit the age of the tasks to delete
requested to merge issue/hosting_task_gc_extra-3226350:3226350-time-limit-for-mode-2 into 7.x-1.x-dev
This adds an option to limit the age of the tasks to delete when using mode 2 (keep only the latest number of tasks per type / site). When this new option is enabled, if a task is newer than the given amount of time it won't be deleted, even if there are newer tasks.
Closes #3226350