Revert "Merge branch 'backport-fix-remaining-prepend-lines' into 'master'"

This reverts merge request !31379

config/initializers/0_inject_enterprise_edition_module.rb

 # frozen_string_literal: true
-require 'active_support/inflector'
-
 module InjectEnterpriseEditionModule
   def prepend_if_ee(constant)
     prepend(constant.constantize) if Gitlab.ee?

qa/qa.rb

@@ -4,9 +4,6 @@ $: << File.expand_path(File.dirname(__FILE__))
 Encoding.default_external = 'UTF-8'
-require_relative '../lib/gitlab'
-require_relative '../config/initializers/0_inject_enterprise_edition_module'
-
 module QA
   ##
   # GitLab QA runtime classes, mostly singletons.