We will track the permission state as enabled
and fire the handler when the state changes
Use a constant from the ConfigModel to control the permission polling interval

Use a waiter instead of waiterWithValue

Adding an initial test for the polling behavior
Adding mocking for setting notifications as enabled/disabled in ShadowRoboNotificationManager
Adding foregroundFetchNotificationPermissionInterval to the MockHelper configModel with a value of 1 ms

This protects init in the background
onFocus is called immediately if the app is in focus and wakes so we start polling correctly

update unit test to account for this

set delay to be 100 ms to fix flakiness