Merge branch '217581-remove-default-ignore-rule' into 'master'

Remove Service#default ignore rule

Closes #217581

See merge request gitlab-org/gitlab!42688

app/models/service.rb

@@ -7,11 +7,8 @@ class Service < ApplicationRecord
   include Importable
   include ProjectServicesLoggable
   include DataFields
-  include IgnorableColumns
   include FromUnion
 
-  ignore_columns %i[default], remove_with: '13.5', remove_after: '2020-10-22'
-
   SERVICE_NAMES = %w[
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     drone_ci emails_on_push ewm external_wiki flowdock hangouts_chat hipchat irker jira