Fix HTTP 500 in /api/v1/emails/check_confirmation (#25595)

app/controllers/api/v1/emails/confirmations_controller.rb

@@ -5,6 +5,7 @@ class Api::V1::Emails::ConfirmationsController < Api::BaseController
   before_action -> { doorkeeper_authorize! :write, :'write:accounts' }, except: :check
   before_action :require_user_owned_by_application!, except: :check
   before_action :require_user_not_confirmed!, except: :check
+  before_action :require_authenticated_user!, only: :check
 
   def create
     current_user.update!(email: params[:email]) if params.key?(:email)