The old query client in this repo is outdated. We should either use existing hooks/mutations, add commonly used hooks/mutations to query-client repo, or extend the query client with hooks/mutations that are solely used in graasp-admin.
There are several places marked 'TODO' in CategorieswView.js, ValidationView.js, SingleValidation.js, which need to add newly created hooks/mutations. Besides, in other views, most existing hooks need to be substituted with new ones.
Similar to Item View, display all item-flag entries.