Add End-to-end tests for List Products functionality

[stefanteixeira]

Description

Add End-to-end tests for List Products functionality (https://front.serverest.dev/admin/listarprodutos page).

Ideally, it should perform the following steps:

• Login as Admin user (you can use openHomepage helper, inside lib/helpers.js)
• Create a product (using getProductBody helper to get a product with random data)
• Open /admin/listarprodutos
• Verify that there is a row with proper product data

Acceptance Criteria

• Tests are properly using Playwright's Locator API (tip: create-product.e2e.test.js for a similar example of Locator usage)
• Tests are added in a proper test file, such as tests/e2e/list-product.e2e.test.js