Ignore the directory that keeps factory files under the lib

Some tests put factory files under the `lib`. But since Rails 7.1,
Rails loads `lib` directory by default in a new application.
https://guides.rubyonrails.org/7_1_release_notes.html#introducing-config-autoload-lib-and-config-autoload-lib-once-for-enhanced-autoloading

But factory files don't follow the naming rule of Zeitwerk. So
Zeitwerk raises `Zeitwerk::NameError`.
To avoid the error, this changed to ignore the directory that puts
factory files.

features/support/rails_template

@@ -3,4 +3,12 @@ if Rails.gem_version < Gem::Version.new('6')
 end
 
 gsub_file "Gemfile", /^ gem 'spring'$/, ' gem "spring", "!= 2.1.1"'
-gsub_file "config/routes.rb",  /^  get/, '  # get'
+gsub_file "config/routes.rb",  /^  get/, '  # get'
+
+if Rails.gem_version >= Gem::Version.new('7.1')
+  append_to_file File.join("config", "application.rb"), <<~RUBY
+    class TestApp::Application
+      config.autoload_lib(ignore: %w(some_railtie))
+    end
+  RUBY
+end