Remove the ignore namespace_id rule from BroadcastMessage

app/models/broadcast_message.rb

@@ -3,7 +3,6 @@
 class BroadcastMessage < MainClusterwide::ApplicationRecord
   include CacheMarkdownField
   include Sortable
-  include IgnorableColumns
 
   ALLOWED_TARGET_ACCESS_LEVELS = [
     Gitlab::Access::GUEST,
@@ -13,8 +12,6 @@ class BroadcastMessage < MainClusterwide::ApplicationRecord
     Gitlab::Access::OWNER
   ].freeze
 
-  ignore_column :namespace_id, remove_with: '16.0', remove_after: '2022-06-22'
-
   cache_markdown_field :message, pipeline: :broadcast_message, whitelisted: true
 
   validates :message,   presence: true