VIA-172 AJ/AS Removed unused function

Author: ankur-jain-nhs

test-data/test-helpers-back-link.tsx

@@ -1,16 +1,5 @@
-import { screen } from "@testing-library/react";
 import { Screen } from "@testing-library/dom/types/screen";
 
-export const initialiseBackLinkMocks = () => {
-  jest.mock("next/navigation", () => ({
-    useRouter: jest.fn(),
-  }));
-
-  jest.mock("@src/app/_components/nhs-frontend/BackLink", () =>
-    jest.fn(() => <div data-testid="back-link"></div>),
-  );
-};
-
 export const assertBackLinkIsPresent = (screen: Screen) => {
   const backLink = screen.getByTestId("back-link");
   expect(backLink).toBeInTheDocument();