FIX: Make category-drop work with lazy_load_categories (#24187)

The category drop was rerendered after every category async change
because it updated the categories list. This is not necessary and
categories can be referenced indirectly by ID instead.

config/routes.rb

@@ -1160,6 +1160,7 @@ Discourse::Application.routes.draw do
 
     resources :categories, except: %i[show new edit]
     post "categories/reorder" => "categories#reorder"
+    get "categories/find" => "categories#find"
     get "categories/search" => "categories#search"
 
     scope path: "category/:category_id" do