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chore(notification_center)[OASIS-5764]: Add all unit tests for the notification_center module (#392)

Summary:
- The notification_center module did not have a unit test associated with it.
- This PR addresses that to ensure 100% coverage of this module.

Test plan:
addNotificationListener
- only valid listener types should have listeners registered
- the listenerId should be returned upon successful registration
- cannot register the same callback twice
removeNotificationListener
- should return true if the listener is successfully removed
- should only remove the specified listener using the listenerId
clearAllNotificationListeners
- should remove all listeners of all types
clearNotificationListeners
- should remove only the specified notification type when there are no listeners registered
- should remove only the specified notification type and leave all other notification type listeners still registered
sendNotifications
- checks that each notification type listeners executes the callback with the passed in notification data from the user

Issues
- Addresses OASIS-5764 (https://optimizely.atlassian.net/browse/OASIS-5764)

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