Add context to "trial during signup" experiment

ee/app/controllers/registrations/groups_controller.rb

@@ -29,7 +29,7 @@ module Registrations
 
         url_params[:trial_onboarding_flow] = true
       else
-        record_experiment_user(:trial_during_signup, trial_chosen: trial)
+        record_experiment_user(:trial_during_signup, trial_chosen: trial, namespace_id: @group.id)
 
         if experiment_enabled?(:trial_during_signup)
           if trial

ee/spec/controllers/registrations/groups_controller_spec.rb

@@ -104,7 +104,11 @@ RSpec.describe Registrations::GroupsController do
       it { is_expected.to redirect_to(new_users_sign_up_project_path(namespace_id: user.groups.last.id, trial: false)) }
 
       it 'calls the record user trial_during_signup experiment' do
-        expect(controller).to receive(:record_experiment_user).with(:trial_during_signup, trial_chosen: false)
+        group = create(:group)
+        expect_next_instance_of(Groups::CreateService) do |service|
+          expect(service).to receive(:execute).and_return(group)
+        end
+        expect(controller).to receive(:record_experiment_user).with(:trial_during_signup, trial_chosen: false, namespace_id: group.id)
 
         subject
       end
@@ -180,7 +184,12 @@ RSpec.describe Registrations::GroupsController do
           let_it_be(:trial_form_params) { { trial: 'false' } }
 
           it 'calls the record user trial_during_signup experiment' do
-            expect(controller).to receive(:record_experiment_user).with(:trial_during_signup, trial_chosen: false)
+            group = create(:group)
+            expect_next_instance_of(Groups::CreateService) do |service|
+              expect(service).to receive(:execute).and_return(group)
+            end
+
+            expect(controller).to receive(:record_experiment_user).with(:trial_during_signup, trial_chosen: false, namespace_id: group.id)
 
             subject
           end