Add logging for violations & testA11y() in utils.ts. Use that method everywhere else

cypress/integration/header.spec.ts

@@ -1,13 +1,14 @@
+import { testA11y } from 'cypress/support/utils';
+
 describe('Header', () => {
     it('should pass accessibility tests', () => {
         cy.visit('/');
-        cy.injectAxe();
 
         // Header must first be visible
         cy.get('ds-header').should('be.visible');
 
         // Analyze <ds-header> for accessibility
-        cy.checkA11y({
+        testA11y({
             include: ['ds-header'],
             exclude: [
                 ['#search-navbar-container'], // search in navbar has duplicative ID. Will be fixed in #1174
@@ -15,4 +16,4 @@ describe('Header', () => {
             ],
         });
     });
-});
+});