Initially, the filtered list was done at the component level, and the list was simply a subset of `notifications`. But due to the limit issue explained in 5694, we now query the filtered list instead.
Considerations:
- The filtered list could contain items not listed in the 'All' list. We could add a string at the bottom of 'All' that says "not all items retrieved" if this confuses the user.
- The unseen count needs to be based on 'All' and not the filtered one, so that data needs to be stashed somehow (can't re-use the array).
Use 2 arrays for now instead of trying to accumulate "all" and "filtered" into 1 array.
## Issue:
Closes 5515: All videos marked as read when clicking a single notification from notification list
## Change:
- Augment `doReadNotifications` to only clear the given IDs. If the argument is `null` or is not a valid array (e.g. when used as a click handlers, the click event object is passed in), all notifications will be cleared.
- Augment `NOTIFICATION_READ_COMPLETED` to only clear the given IDs.
## Notes:
- Wasn't sure of the API will fail if the ID is invalid, so I start from `unreadNotifications` first, then only filtering it further with the given ID. Otherwise, we could just skip the `unreadNotifications` filtering.
