The previous `formset:added` handler was referencing an undefined value
(and seemed to just be an error in general). I've changed it to
reference the target element and search as appropriate, and it seems to
now properly allow inline added forms.

Per https://github.com/23/resumable.js:

If the request returns anything else, the chunk will be uploaded in the
standard fashion. (It is recommended to return 204 No Content in these cases
if possible to avoid unwarranted notices in browser consoles.)

Thus this should avoid unneccessary error spew while uploading files.

It should just default to whatever the field would be using in the first
place.

Fix inline added filefields

Add back Django 5.1 storage config

Remove storage file and consolidate