Fix GraphQL docs classes

When eager loading the app in production, this fails because it expects
these files to define their respective classes.

We just skip these files from the autoloader and require them manually
for now

config/initializers_before_autoloader/002_zeitwerk.rb

@@ -10,6 +10,9 @@ Rails.autoloaders.each do |autoloader|
   # Mailer previews are also loaded manually by Rails
   autoloader.ignore(Rails.root.join('app/mailers/previews'))
   autoloader.ignore(Rails.root.join('ee/app/mailers/previews')) if Gitlab.ee?
+  # Ignore these files because these are only used in Rake tasks
+  # and are not available in production
+  autoloader.ignore(Rails.root.join('lib/gitlab/graphql/docs'))
 
   autoloader.inflector.inflect(
     'api' => 'API',

lib/gitlab/graphql/docs/helper.rb

 # frozen_string_literal: true
 
-return if Rails.env.production?
-
 module Gitlab
   module Graphql
     module Docs

lib/gitlab/graphql/docs/renderer.rb

 # frozen_string_literal: true
 
-return if Rails.env.production?
+require 'gitlab/graphql/docs/helper'
 
 module Gitlab
   module Graphql

lib/tasks/gitlab/graphql.rake

@@ -3,6 +3,7 @@
 return if Rails.env.production?
 
 require 'graphql/rake_task'
+require 'gitlab/graphql/docs/renderer'
 
 namespace :gitlab do
   OUTPUT_DIR = Rails.root.join("doc/api/graphql/reference")

spec/lib/gitlab/graphql/docs/renderer_spec.rb

 # frozen_string_literal: true
 
 require 'spec_helper'
+require 'gitlab/graphql/docs/renderer'
 
 describe Gitlab::Graphql::Docs::Renderer do
   describe '#contents' do