Require action_view/helpers instead of rails-html-sanitizer

This will avoid a warning about circular dependencies.

/circular require considered harmful.*rails-html-sanitizer/

This happens because `rails-html-sanitizer` requires `action_view/helpers`
that requires `action_view/helpers/sanitize_helper` that requires
`rails-html-sanitizer`.

I'll properly fix this in rails-html-sanitizer later removing the code
that needs to be added to ActionView::Helpers in that gem.

Author: rafaelfranca

activesupport/lib/active_support/testing/strict_warnings.rb

@@ -10,7 +10,6 @@ class WarningError < StandardError; end
     PROJECT_ROOT = File.expand_path("../../../../", __dir__)
     ALLOWED_WARNINGS = Regexp.union(
       /circular require considered harmful.*delayed_job/, # Bug in delayed job.
-      /circular require considered harmful.*rails-html-sanitizer/, # Bug when sprockets-rails is not required.
 
       # Expected non-verbose warning emitted by Rails.
       /Ignoring .*\.yml because it has expired/,

railties/lib/rails/application/configuration.rb

@@ -308,12 +308,12 @@ def load_defaults(target_version)
           end
 
           if respond_to?(:action_view)
-            require "rails-html-sanitizer"
+            require "action_view/helpers"
             action_view.sanitizer_vendor = Rails::HTML::Sanitizer.best_supported_vendor
           end
 
           if respond_to?(:action_text)
-            require "rails-html-sanitizer"
+            require "action_view/helpers"
             action_text.sanitizer_vendor = Rails::HTML::Sanitizer.best_supported_vendor
           end
         when "7.2"