Dataset name - review approach to improve security and ease revalidation of GpU documents

[mborne]

Actions

• Validate clientOriginalName according to a regexp (and move archive to validation/{uid}/upload/archive.zip to avoid security risks?)
• Keep validation.datasetName = clientOriginalName when validation is created
• Review archive extraction : If the archive contains a single directory, overwrite {validation.datasetName} with this directory name and extract to validation/{uid}/{validation.datasetName} without a subfolder