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.
