In the original approach we completely ignored subscribers who subscribed and unsubscribed
within the last 30 days.
Based on the feedback from QA this was quite confusing.
This commit changes the logic and instead of looking at current status we fetch the counts
based on logs (the lastSubscribedAt column and statistics_unsubscribes table) and we ignore the current status.
On the list level we don't have any logs so we still need to check the current status on the list level,
but newly we ignore the global status.
[MAILPOET-4828]
We want to show admin how many subscribers subscribed to a list and how many
unsubscribed within last 30 days so that they see the change.
If someone subscribed and also unsubscribed within those 30 days we skip him.
We don't have data to detect they were really subscribed at some point.
[MAILPOET-4828]
For mutable Carbon object $now->subMinute() was altering also $now variable which was causing that the saved engagement at was not accurate.
[MAILPOET-3897]
