All files should have a size

[edsu]

In order to prevent bugs like sul-dlss/was_robot_suite#701 we should require files to have an associated size:

https://github.com/sul-dlss/cocina-models/blob/main/openapi.yml#L1062-L1070

Part of this would require looking to see how many files there are that lack sizes, and if missing, whether they can be determined.