Add addtional assignment event for experiment

An additional assignment event is needed for the project_templates_during_registration experiment

ee/app/controllers/registrations/groups_controller.rb

@@ -86,6 +86,9 @@ def track_event(action)
     end
 
     def track_project_registration_submission(project)
+      experiment(:project_templates_during_registration, user: current_user).track(:assignment,
+        namespace: project.namespace)
+
       experiment_project_templates_during_registration(
         project,
         :successfully_submitted_form,

ee/spec/controllers/registrations/groups_controller_spec.rb

@@ -187,6 +187,7 @@
 
         it 'tracks submission event' do
           expect(experiment).to receive(:publish)
+          expect(experiment).to receive(:track).with(:assignment, namespace: an_instance_of(Group))
           expect(experiment).to receive(:track).with(:successfully_submitted_form, label: 'free_registration')
 
           expect(experiment).not_to receive(:track).with(
@@ -202,6 +203,7 @@
 
           it 'tracks submission event' do
             expect(experiment).to receive(:publish)
+            expect(experiment).to receive(:track).with(:assignment, namespace: an_instance_of(Group))
             expect(experiment).to receive(:track).with(:successfully_submitted_form, label: 'free_registration')
 
             expect(experiment).to receive(:track).with(
@@ -220,6 +222,7 @@
 
           it 'tracks submission event' do
             expect(experiment).to receive(:publish)
+            expect(experiment).to receive(:track).with(:assignment, namespace: an_instance_of(Group))
             expect(experiment).to receive(:track).with(:successfully_submitted_form, label: 'trial_registration')
 
             post_create
@@ -259,6 +262,7 @@
 
           it 'does not track submission event' do
             expect(experiment).to receive(:publish)
+            expect(experiment).not_to receive(:track).with(:assignment, namespace: an_instance_of(Group))
             expect(experiment).not_to receive(:track).with(:successfully_submitted_form, label: 'free_registration')
 
             post_create