[with-jest]: Update to use automatic path aliases

[JohnDaly]

Updating the with-jest example to make use of the automatic path alias feature that was added in #45815

I've also updated the dependencies in the example

[markmcdermid]

@JohnDaly thanks for the PR <3 - I'm trying to upgrade our test suite dependencies (a minefield) and this will be extremely helpful!

Unfortunately it doesn't look like this works for mocks, which would make it very hard for us to use (we'd still need to do some alias/path mapping in jest-config)

Adding the following to the Jest example:

components/MyComponent.tsx

export const MyComponent = () => <h1>Hi</h1>;

index.test.tsx

import { render, screen } from "@testing-library/react";
import Home from "@/pages/index";

jest.mock("@/components/MyComponent");

describe("Home", () => {
  it("renders a heading", () => {
    render(<Home />);

    const heading = screen.getByRole("heading", {
      name: /welcome to next\.js!/i,
    });

    expect(heading).toBeInTheDocument();
  });
});

Results in: Cannot find module '@/components/MyComponent' from '__tests__/index.test.tsx'

Do you have any suggestions?