[IMAPx] Notify about new messages early during folder update

The folder update is split into two phases:
a) check for newly received messages
b) update flags of the old message and discover removed message.
After some recent changes the notification from the first phase
had been waiting for the completion of the second phase, which could
also exhibit (in the Evolution) as the folder tree having unread count
changed, but the folder content didn't show any new messages until
the both phases finished.

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