Simplify using helper methods in components

The `use_helpers` method was added in ViewComponent 3.8.0, and it's
included by default in all components since version 3.11.0.

Note we sometimes delegated the `can?` method to the controller instead
of the helpers, for no particularly reason. We're unifying that code as
well.

app/components/admin/poll/questions/form_component.rb

@@ -2,7 +2,7 @@ class Admin::Poll::Questions::FormComponent < ApplicationComponent
   include TranslatableFormHelper
   include GlobalizeHelper
   attr_reader :question, :url
-  delegate :can?, to: :helpers
+  use_helpers :can?
 
   def initialize(question, url:)
     @question = question