Wrap the disable referential integrity block in a transaction

If the block passed to disable referential integrity fails, triggers could be
left disabled, so instead, make sure the disable, block contents, and enable
are run in a transaction so they all run or nothing.

Similar to https://www.github.com/rails/rails/pull/50196

Author: jrafanie

lib/extensions/database_cleaner-activerecord-seeded_deletion.rb

@@ -5,6 +5,12 @@ module ActiveRecord
     # SeededDeletion is a strategy that deletes all records from tables except those that existed before it was instantiated
     # This is useful for tests that need the seeded data to be present.
     class SeededDeletion < Deletion
+      def clean
+        connection.transaction(:requires_new => true) do
+          super
+        end
+      end
+
       def start
         Rails.logger.info "SeededDeletion strategy start"
         self.class.table_max_id_cache = table_max_id_hash