Merge branch '4195-geo-node-tech-debt' into 'master'

Remove unneeded ignore_column statements for GeoNode

Closes #4195

See merge request gitlab-org/gitlab-ee!3819

ee/app/models/geo_node.rb

 class GeoNode < ActiveRecord::Base
-  include IgnorableColumn
   include Presentable
 
-  ignore_column :clone_protocol
-  ignore_column :geo_node_key_id
-
   belongs_to :oauth_application, class_name: 'Doorkeeper::Application', dependent: :destroy # rubocop: disable Cop/ActiveRecordDependent
 
   has_many :geo_node_namespace_links