Mails should be removed from mailitemchunk table after being successfully processed

Problem Definition

Currently JEPP stores all mails fetched from the mail server into AO_2C4E5C_MAILITEMCHUNK table and keeps them in the table for a period of time (45 days by default, minimum 14 days).
This causes the DB size to increase really quick.

This table's main purpose is to make sure Service Desk will process all mails fetched from the mail server and, in case of any problems, keep the email for reprocessing in the future so it isn't lost.

Suggested Solution

We should remove the mails successfully processed right after they are processed to avoid storing information that won't be needed.