Merge branch '217941-remove-ignore-update-at-column-code' into 'master'

Remove ignore column code on `updated_at` field

Closes #217941

See merge request gitlab-org/gitlab!40249

app/models/audit_event.rb

@@ -8,7 +8,6 @@ class AuditEvent < ApplicationRecord
   PARALLEL_PERSISTENCE_COLUMNS = [:author_name, :entity_path, :target_details, :target_type].freeze
 
   ignore_column :type, remove_with: '13.6', remove_after: '2020-11-22'
-  ignore_column :updated_at, remove_with: '13.4', remove_after: '2020-09-22'
 
   serialize :details, Hash # rubocop:disable Cop/ActiveRecordSerialize