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 [[ https://drive.google.com/file/d/1PKAgacbvNJ3s6YShJlLNrO30rwSxsq62/view | 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 also [here](https://gerrit.wikimedia.org/r/c/mediawiki/extensions/UploadWizard/+/1119098/comment/c12d312d_a2de2afc/)**
[] 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 `500`, see also [here](https://gerrit.wikimedia.org/r/c/mediawiki/extensions/UploadWizard/+/1119098/comment/c12d312d_a2de2afc/)**
[] If more items than can be fit in a window a scroll bar should be visible