Adjust facilities tab so that it will fetch the next page of facilities
on reaching the bottom of the infinite scroll list.

Also:

- remove some now unused utility code & tests
- update facilities list endpoint to return results in alphabetical
order
- update url to retrieve facilities to request pages of 25 results at a
time
- add a loading indicator contextually if there's a next page of facilities to fetch

Restore the old sidebar facilities tab as a
`NonVectorTileFilterSidebarFacilitiesTab` component so that it can be
displayed when the vector_tile flag is off.

Restore some utility functions (moved into the NonVectorTile...
component) which were required to make the component work, along with
some Redux actions it expected to exist.

Adjust the fetchFacilities function to accept an options object so that
callers can set the page request size. We don't need to make a similar
adjustment to the fetchNextPage function since it uses the URL returned
from the API for its next page of results.