Remove local blob copy on ARender Previewer

Context

We currently fetch and copy in a temporary directory the Nuxeo blob on ARender Previewer side due to some issues in former ARender version.
This was probably due to the ARender's flow which wasn't able to stream the blob from Nuxeo when the Rendition asked the blob to Previewer.

Goals

Issue have been reported fixed by ARender and so we want to remove this local copy in order to improve performance and reduce needed space on ARender Previewer.