User details: pagination issues when orders from Barn/Prod API are requested

[elena-zh]

Originally reported in #132 (comment)

Orders list pagination does not work as expected. See the video: https://watch.screencastify.com/v/YSoUCU7TRfQcyJ0yElph

The issue was introduced by merging of the responses of user orders by env. So the old way of paginating doesn't work correctly as the orders can be either in the prod or barn api, or both, so the logic to know if there's more data to move to the next page is wrong.

Possible options how to resolve the issue:

1. Add an endpoint for pagination
2. Add an option to a user to select what orders to see (from Barn/Prod APIs), then show orders according to a selected option (no changes to pagination)