Omit links with tab aria role from link tracking

Tabs have their own tracking built in to the component from the govuk_publishing_components gem. No need for us to duplicate it.

app/assets/javascripts/admin/analytics-modules/ga4-link-setup.js

@@ -12,6 +12,10 @@ window.GOVUK.analyticsGa4.analyticsModules =
       moduleElements.forEach(function (moduleElement) {
         const links = moduleElement.querySelectorAll('a')
         links.forEach((link) => {
+          // Exclude links that serve as tab controls as they have their own event tracking
+          if (link.role === 'tab') {
+            return
+          }
           const event = {
             event_name: 'navigation',
             type: link.role === 'button' ? 'button' : 'generic_link'

spec/javascripts/admin/analytics-modules/ga4-link-setup.spec.js

@@ -31,4 +31,13 @@ describe('GOVUK.analyticsGa4.analyticsModules.Ga4LinkSetup', function () {
       '{"event_name":"navigation","type":"button"}'
     )
   })
+
+  it('excludes links that serve as tab controls', function () {
+    link.role = 'tab'
+
+    const Ga4LinkSetup = GOVUK.analyticsGa4.analyticsModules.Ga4LinkSetup
+    Ga4LinkSetup.init()
+
+    expect(link.dataset.ga4Link).toBeUndefined()
+  })
 })