Fix EZP-23312: Async pub: old processes are filling up the database

Link: https://jira.ez.no/browse/EZP-23312

## Description
This is a follow up of #1067. It replaces command line arguments by ini configuration so it is more coherent with existing way to setup the deamon: https://doc.ez.no/eZ-Publish/Technical-manual/5.x/Features/Queue-handling-in-asynchronous-publishing/Enable-the-publishing-queue-functionality

## Tests
Manual tests
a Period is an Interval of time. i'd give it another name like "AgeLimit" or "AgeGap", and put the comment more explicit, such as "only older processes than..."