Rewrite integration test for project-long-description-test component

# Problem

Currently, `tests/integration/components/project-long-description-test.js` doesn't make full use of its page object by not defining a renderPage() function. To dry up the code, you can set a renderPage() function above the `moduleForComponent`, pass in the needed hbs selectors, and call renderPage() in each test.

## References
#1605

Comece por tests/integration/components/project-long-description-test.js e inspecione seu page object, a configuração de moduleForComponent e os seletores hbs existentes. Defina o helper renderPage() solicitado acima de moduleForComponent, use-o em cada teste e confirme que os testes de integração continuam passando.

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