Add scroll tracking to answers

- adds percentage scroll tracking to a selection of answer pages

app/views/content_items/answer.html.erb

@@ -10,13 +10,32 @@
     scroll_track_percent_paths = [
       "/get-coronavirus-test",
     ]
+    ga4_scroll_track_headings_paths = [
+      "/personal-tax-account",
+      "/log-in-file-self-assessment-tax-return",
+      "/benefits-calculators",
+      "/national-minimum-wage-rates",
+      "/order-coronavirus-rapid-lateral-flow-tests",
+      "/contact-hmrc",
+      "/dbs-update-service",
+      "/tax-free-childcare",
+      "/check-income-tax-current-year",
+      "/apply-apprenticeship",
+      "/report-covid19-result",
+      "/order-copy-birth-death-marriage-certificate",
+      "/global-health-insurance-card"
+    ]
   %>
   <% if scroll_track_headings_paths.include?(@content_item.base_path) %>
     <meta name="govuk:scroll-tracker" content="" data-module="auto-scroll-tracker" data-track-type="headings"/>
   <% elsif scroll_track_percent_paths.include?(@content_item.base_path) %>
     <meta name="govuk:scroll-tracker" content="" data-module="auto-scroll-tracker"/>
   <% end %>
 
+  <% if ga4_scroll_track_headings_paths.include?(@content_item.base_path) %>
+    <meta name="govuk:scroll-tracker" content="" data-module="ga4-scroll-tracker"/>
+  <% end %>
+
   <%= @requested_variant.analytics_meta_tag.html_safe if @requested_variant.present? %>
 <% end %>