Switch ember-cli-page-object to native DOM helpers

# Problem

ember-cli-page-object now has the option to no longer rely on global test helpers and instead use native DOM helpers.

https://github.com/san650/ember-cli-page-object/releases/tag/v1.13.0

However, enabling this option in our case breaks some tests, so we need to resolve those issues.

## Subtasks
- [ ] Enable the option to use native dom helpers.
- [ ] Fix broken tests

Comece revisando as notas de versão do ember-cli-page-object v1.13.0 vinculadas na issue e habilite a opção native DOM helpers na configuração do projeto. Execute a suíte de testes para identificar os testes que falharam, resolva essas falhas e confirme que a suíte completa passa com a opção habilitada.

Escrita pelo modelo de indexação a partir do texto da issue.