Move lengthy data attributes from view into helper

Adds a new helper method, data_attributes_for_progress_bar, and tests it
Removes the onboarding_issues_experiment_enabled variable from the view

ee/app/helpers/ee/registrations_helper.rb

@@ -57,8 +57,11 @@ module EE
       onboarding_issues_experiment_enabled? ? continue : get_started
     end
 
-    def onboarding_issues_experiment_enabled?
-      experiment_enabled?(:onboarding_issues)
+    def data_attributes_for_progress_bar_js_component
+      {
+        is_in_subscription_flow: in_subscription_flow?.to_s,
+        is_onboarding_issues_experiment_enabled: onboarding_issues_experiment_enabled?.to_s
+      }
     end
 
     def skip_setup_for_company?
@@ -73,5 +76,9 @@ module EE
         URI.parse(redirect_to).path if redirect_to
       end
     end
+
+    def onboarding_issues_experiment_enabled?
+      experiment_enabled?(:onboarding_issues)
+    end
   end
 end

ee/app/views/registrations/welcome/_progress_bar.html.haml

 - if show_signup_flow_progress_bar?
-  #progress-bar{ data: { is_in_subscription_flow: in_subscription_flow?.to_s, is_onboarding_issues_experiment_enabled: onboarding_issues_experiment_enabled?.to_s } }
+  #progress-bar{ data: data_attributes_for_progress_bar_js_component }

ee/spec/helpers/ee/registrations_helper_spec.rb

@@ -245,6 +245,26 @@ RSpec.describe EE::RegistrationsHelper do
     end
   end
 
+  describe '#data_attributes_for_progress_bar_js_component' do
+    before do
+      allow(helper).to receive(:in_subscription_flow?).and_return(options_enabled)
+      allow(helper).to receive(:onboarding_issues_experiment_enabled?).and_return(options_enabled)
+    end
+
+    subject { helper.tag(:div, data: helper.data_attributes_for_progress_bar_js_component) }
+
+    where(:options_enabled, :attr_values) do
+      true  | 'true'
+      false | 'false'
+    end
+
+    with_them do
+      it 'always includes both attributes with stringified boolean values' do
+        is_expected.to eq(%{<div data-is-in-subscription-flow="#{attr_values}" data-is-onboarding-issues-experiment-enabled="#{attr_values}" />})
+      end
+    end
+  end
+
   describe '#skip_setup_for_company?' do
     let(:user) { create(:user) }
 

ee/spec/views/registrations/welcome.html.haml_spec.rb

@@ -10,7 +10,7 @@ RSpec.describe 'registrations/welcome' do
   before do
     allow(view).to receive(:current_user).and_return(user)
     allow(view).to receive(:redirect_path).and_return(redirect_path)
-    allow(view).to receive(:experiment_enabled?).with(:onboarding_issues).and_return(onboarding_issues_experiment_enabled)
+    allow(view).to receive(:onboarding_issues_experiment_enabled?).and_return(onboarding_issues_experiment_enabled)
     allow(Gitlab).to receive(:com?).and_return(true)
 
     render