This ticket is part of the EPIC T383055 and following up to T383720

This ticket is follow up task of T383720 to further enhance the category selection in upload wizard

• Show a full list of sub categories by adding the ability to scroll within autocomplete list as shown in this video
  • Some of the list of sub-categories may be very large so either show only relevant categories or define a max number of items to show (to be discussed) - we decided to set the upper limit to 500, see the patch's commit message and also here
  • If more items than can be fit in a window a scroll bar should be visible
• Optionally, expand the number of initial matches that one can scroll through. A max number of items that can be shown will need to be defined (to be discussed) - we decided to set the upper limit to 50, see the patch's commit message
  • If more items than can be fit in a window a scroll bar should be visible