SG-30400 Retrieve thumbnails from any FileItem that has a 'thumbnail_path'

[kennedy0]

The filter_work_files hook allows you to provide a thumbnail, but it's not used due to the file_item.is_published requirement in the FileModel._process_files method. This leaves us unable to show thumbnails for working files.

With this requirement removed, the filter_work_files hook can provide thumbnails as a file URI:

class FilterWorkFiles(HookClass):
    def execute(self, work_files, **kwargs):
        for wf in work_files:
            wf['work_file']['thumbnail'] = "file:///my_thumbnail.jpg"
        return work_files

[carlos-villavicencio-adsk]

Thank you for this contribution. We will review this internally before merging.