Fix: credit notes sorting

[annvelents]

Context

we show credit notes on invoice page and on all credit notes page
at invoice page we sort them by created_at of type date_time
at the all credit notes page we sort them by issuing_date of type date

As result they are sorted slightly differently and they are not sorted accurately on the all credit notes page

Description

Unified ways we sort credit notes, using :created_at for sorting