Add presentation data to external resource

[jcoyne]

There is a test in this suite that creates an external resource with no image data. This causes HB to log a notice, which is a distraction. Ideally it would create proper data so that we don't get the notification.

https://app.honeybadger.io/projects/48916/faults/108092570

[Data Error] External resource has no presentation data

[andrewjbtw]

I believe this will require supplying image dimensions via sdr-api or some alternative method. This test puts images directly through accessionWF, which does not have the exif metadata extraction step that assemblyWF uses to generate this metadata. Alternatively, the test could send items through assemblyWF.