refac: repository updates, image attachment and deletes report the domain not-found error for an unknown id, the same for articles, users and images, and the test fakes stop returning GORM errors

api/handlers/article/articleHandler.go

@@ -127,6 +127,10 @@ func (h *Handler) DeleteArticle(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if err := h.DeleteUseCase.DeleteArticle(uint32(id)); err != nil {
+		if errors.Is(err, domain.ErrArticleNotFound) {
+			http.Error(w, apperr.ArticleNotFoundErrorMessage, http.StatusNotFound)
+			return
+		}
 		http.Error(w, "Failed to delete article", http.StatusInternalServerError)
 		return
 	}