Add custom header text to free personal namespaces billing page

 - add text
 - add specs

Changelog: added

ee/app/views/shared/billings/_billing_plan_header.html.haml

@@ -20,7 +20,10 @@
     - else
       = s_("BillingPlans|%{group_name} is currently using the %{plan_name}.").html_safe % { group_name: namespace.full_name, plan_name: plan.name }
 
-  - if parent_group
+  - if namespace.free_personal?
+    - groups_link = link_to s_("BillingPlans|group"), dashboard_groups_path
+    %p= html_escape_once(s_("BillingPlans|Looking to purchase or manage a subscription for your group? Navigate to your %{groups_link} and go to %{strong_open}Settings &gt; Billing.%{strong_close}")).html_safe % { groups_link: groups_link.html_safe, strong_open: '<strong>'.html_safe, strong_close: '</strong>'.html_safe }
+  - elsif parent_group
     %p= s_("BillingPlans|This group uses the plan associated with its parent group.")
     - parent_billing_page_link = link_to parent_group.full_name, group_billings_path(parent_group)
     %p= s_("BillingPlans|To manage the plan for this group, visit the billing section of %{parent_billing_page_link}.").html_safe % { parent_billing_page_link: parent_billing_page_link }

ee/spec/features/billings/billing_plans_spec.rb

@@ -210,6 +210,13 @@ RSpec.describe 'Billing plan pages', :feature, :js do
         visit page_path
       end
 
+      it 'displays the correct call to action', :js do
+        page.within('.billing-plan-header') do
+          expect(page).to have_content('Looking to purchase or manage a subscription for your group? Navigate to your group and go to Settings > Billing')
+          expect(page).to have_link('group', href: dashboard_groups_path)
+        end
+      end
+
       it_behaves_like 'does not display the billing plans'
       it_behaves_like 'plan with subscription table'
     end

locale/gitlab.pot

@@ -5051,6 +5051,9 @@ msgstr ""
 msgid "BillingPlans|Learn more about each plan by visiting our %{pricing_page_link}."
 msgstr ""
 
+msgid "BillingPlans|Looking to purchase or manage a subscription for your group? Navigate to your %{groups_link} and go to %{strong_open}Settings > Billing.%{strong_close}"
+msgstr ""
+
 msgid "BillingPlans|Manage plan"
 msgstr ""
 
@@ -5087,6 +5090,9 @@ msgstr ""
 msgid "BillingPlans|frequently asked questions"
 msgstr ""
 
+msgid "BillingPlans|group"
+msgstr ""
+
 msgid "BillingPlans|monthly"
 msgstr ""