Fix n+1 queries when rendering initial state JSON (#19795)

app/serializers/initial_state_serializer.rb

@@ -85,11 +85,15 @@ class InitialStateSerializer < ActiveModel::Serializer
 
   def accounts
     store = {}
+
+    ActiveRecord::Associations::Preloader.new.preload([object.current_account, object.admin, object.owner, object.disabled_account, object.moved_to_account].compact, [:account_stat, :user, { moved_to_account: [:account_stat, :user] }])
+
     store[object.current_account.id.to_s]  = ActiveModelSerializers::SerializableResource.new(object.current_account, serializer: REST::AccountSerializer) if object.current_account
     store[object.admin.id.to_s]            = ActiveModelSerializers::SerializableResource.new(object.admin, serializer: REST::AccountSerializer) if object.admin
     store[object.owner.id.to_s]            = ActiveModelSerializers::SerializableResource.new(object.owner, serializer: REST::AccountSerializer) if object.owner
     store[object.disabled_account.id.to_s] = ActiveModelSerializers::SerializableResource.new(object.disabled_account, serializer: REST::AccountSerializer) if object.disabled_account
     store[object.moved_to_account.id.to_s] = ActiveModelSerializers::SerializableResource.new(object.moved_to_account, serializer: REST::AccountSerializer) if object.moved_to_account
+
     store
   end