BAP-12859: Oro\Bundle\ReminderBundle\Entity\Reminder entity does't pass validation once loaded from database (#7534)
BAP-12859: Oro\Bundle\ReminderBundle\Entity\Reminder entity does't pass validation once loaded from database (#7534)

- added PostLoad Event that initializes ReminderInterval after entity is loaded.
orocrm/platform,orocrm/platform,orocrm/platform