[BUG] - FileAttributeValueHandler does not download files for all locales when attribute has value per locale in Akeneo

[fabianaromagnoli]

Describe the bug
FileAttributeValueHandler does not download files for all locales when attribute has value per locale in Akeneo

To Reproduce
Steps to reproduce the behavior:

1. Create a file attribute "pdf_datasheet" in Akeneo with value per locale set tot true
2. Create the corresponding "pdf_datasheet" text attribute in Sylius
3. Create a product in Akeneo and populate the "pdf_datasheet" attribute with differente values for two different locales (it_IT and en_150)
4. Import this product to Sylius

Expected behavior
The attribute "pdf_datasheet" has both Italian and English values and both files have been downloaded to the configured download path

Actual behavior
The attribute "pdf_datasheet" has both Italian and English values but only the it_IT file has been downloaded to the configured download path