Feat: hide pagination widget when not needed

[presleyp]

Closes #4892 and #4623

We need the pagination widget to show when

• there are multiple pages of records
• the user landed on a page beyond the records and needs the ability to navigate back

We don't need the pagination widget when

• there is only one page of records
• the number of records hasn't loaded yet (if it shows and then the count is <=1 page, it will disappear again)

This should satisfy all of those! It assumes that we will always include count in our pagination - we used to support count-less pagination with the widget showing previous and next buttons but no page number buttons, but now we rely on the count being available and hide the widget when it's not (because that should mean it's loading, not that it's not going to be available).

[kylecarbs]

Neato