Merge branch 'id-require-irb-for-initializer' into 'master'

Require irb gem for an initializer

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/183535



Merged-by: Stan Hu <stanhu@gmail.com>
Approved-by: Stan Hu <stanhu@gmail.com>
Co-authored-by: Igor Drozdov <idrozdov@gitlab.com>

config/initializers/irb.rb

 # frozen_string_literal: true
 
+require 'irb'
+
 if Gitlab::Runtime.console?
   # Stop irb from writing a history file by default.
   module IrbNoHistory