Add data-article to citable document types

[Copilot]

Documents with type data-article were not being marked as citable in metrics calculations. This extends the citable document types list to include them.

Changes

• updatesearch/pipeline_xml.py: Added data-article to CITABLE_DOCUMENT_TYPES tuple
• tests/test_xmlpipeline.py: Added test case for data-article citability

Impact

Documents of type data-article will now have is_citable='is_true' in Solr index, enabling them to be included in citation metrics alongside other citable types (research-article, review-article, case-report, etc).

CITABLE_DOCUMENT_TYPES = (
    u'article-commentary',
    u'brief-report',
    u'case-report',
    u'data-article',  # New
    u'rapid-communication',
    u'research-article',
    u'review-article'
)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Search-Journals-Proc] Considerar nas métricas o tipo de documento data-article como citável</issue_title>
<issue_description>### Descrição da tarefa
Considerar nas métricas o tipo de documento data-article como citável.
Este issue atende parte da resolução de outro issue: scieloorg/articles_meta#183

Considerações e notas

Rastrear o código para verificar se poderá ocorrer outros impactos baseados nesta tarefa.

Arquivos que serão afetados:
https://github.com/scieloorg/search-journals-proc/blob/master/updatesearch/pipeline_xml.py#L45</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Search-Journals-Proc] Considerar nas métricas o tipo de documento data-article como citável #3

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