PDI-10942 - Job get emails JobEntry does not mark emails as 'read' when load emails content

Added fix. Remote email folder is always attempt to open in RW mode if
protocol is not POP3, attempt to read email content marks email as read.

Fix brings 2 things: we always attempts to open remote folder in rw mode to have ability manage emails flags, and if attempt to load message content was performed we directly mark this email as read.