Use attribute for User#bypass_registration_checks? (#35580)

app/models/user.rb

@@ -132,9 +132,10 @@ class User < ApplicationRecord
   delegate :can?, to: :role
 
   attr_reader :invite_code, :date_of_birth
-  attr_writer :bypass_registration_checks, :current_account
+  attr_writer :current_account
 
   attribute :external, :boolean, default: false
+  attribute :bypass_registration_checks, :boolean, default: false
 
   def self.those_who_can(*any_of_privileges)
     matching_role_ids = UserRole.that_can(*any_of_privileges).map(&:id)
@@ -477,10 +478,6 @@ class User < ApplicationRecord
     Setting.registrations_mode == 'open'
   end
 
-  def bypass_registration_checks?
-    @bypass_registration_checks
-  end
-
   def sanitize_role
     self.role = nil if role.present? && role.everyone?
   end