Fetch reviews page per page during the cron import

Here is a patch without tests modifications for now.

The new queue worker was missing from the previous patch.

Here is a patch that fixes the interface fatal error and prevents duplicated queue items from being created.

I fixed error in tests and added new assertions.

Thanks for your enhancements on this patch @solene_ggd!

Automatically closed - issue fixed for 2 weeks with no activity.