Use GitlabDanger class when determining rules

Dangerfile

 # frozen_string_literal: true
+
+require_relative 'lib/gitlab_danger'
+
 danger.import_plugin('danger/plugins/helper.rb')
 danger.import_plugin('danger/plugins/roulette.rb')
 
 unless helper.release_automation?
-  danger.import_dangerfile(path: 'danger/metadata')
-  danger.import_dangerfile(path: 'danger/changes_size')
-  danger.import_dangerfile(path: 'danger/changelog')
-  danger.import_dangerfile(path: 'danger/specs')
-  danger.import_dangerfile(path: 'danger/gemfile')
-  danger.import_dangerfile(path: 'danger/database')
-  danger.import_dangerfile(path: 'danger/documentation')
-  danger.import_dangerfile(path: 'danger/frozen_string')
-  danger.import_dangerfile(path: 'danger/commit_messages')
-  danger.import_dangerfile(path: 'danger/duplicate_yarn_dependencies')
-  danger.import_dangerfile(path: 'danger/prettier')
-  danger.import_dangerfile(path: 'danger/eslint')
-  danger.import_dangerfile(path: 'danger/roulette')
-  danger.import_dangerfile(path: 'danger/single_codebase')
-  danger.import_dangerfile(path: 'danger/gitlab_ui_wg')
-  danger.import_dangerfile(path: 'danger/ce_ee_vue_templates')
-  danger.import_dangerfile(path: 'danger/only_documentation')
+  GitlabDanger.new(helper.gitlab_helper).rule_names.each do |file|
+    danger.import_dangerfile(path: File.join('danger', file))
+  end
 end