Fix Rails/BulkChangeTable cop (#26890)

db/migrate/20211112011713_add_language_to_preview_cards.rb

@@ -2,8 +2,12 @@
 
 class AddLanguageToPreviewCards < ActiveRecord::Migration[6.1]
   def change
-    add_column :preview_cards, :language, :string
-    add_column :preview_cards, :max_score, :float
-    add_column :preview_cards, :max_score_at, :datetime
+    safety_assured do
+      change_table(:preview_cards, bulk: true) do |t|
+        t.column :language, :string
+        t.column :max_score, :float
+        t.column :max_score_at, :datetime
+      end
+    end
   end
 end