Add spec for well known change password endpoint (#27856)

spec/requests/well_known/change_password_spec.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe 'The /.well-known/change-password request' do
+  it 'redirects to the change password page' do
+    get '/.well-known/change-password'
+
+    expect(response).to redirect_to '/auth/edit'
+  end
+end