Fix deadlock when a lot of notifications are received in a very short time span

[JF002]

When a notification is received, SystemTask sends messages to DisplayApp, which loads the Notifications apps that sends a few messages to SystemApp. When notification are received too quickly, DisplayApp and SystemTask cannot process those messages fast enough (probably because of the time it takes to refresh the display) and the message queues fill up. When they are full, the current implementation just waits until there's room available to store the event. In this case, since both tasks exchange messages, they end up in a deadlock.

This fix consists in setting the timeout value to 0 (non-blocking mode) for the NewNotification messages on the DisplayApp side. This will prevent the SystemTask from being blocked (which would result in the watchdog reseting the watch). A more generic approach should be design in the future.

Fixes #1888

[github-actions[bot]]

Build size and comparison to main:	Section	Size	Difference
text	377512B	0B
data	940B	0B
bss	63420B	0B