Merge branch '239380-fix-already-initialized-constant-warnings-for-httperror' into 'master'

Fix: already initialized constant warnings for HTTPError

Closes #239380

See merge request gitlab-org/gitlab!40142

lib/gitlab/danger/roulette.rb

 # frozen_string_literal: true
 
 require_relative 'teammate'
-require_relative 'request_helper'
+require_relative 'request_helper' unless defined?(Gitlab::Danger::RequestHelper)
 
 module Gitlab
   module Danger