Use git-lfs for test images

[pjbull]

Overview

Currently test images are stored in the git repository. These files won't change much so we should try to save bandwidth and separate concerns by tracking them with git-lfs instead.

Expected Behavior

DICOM images in tests/assets are managed with git-lfs

Acceptance criteria

• test images are managed by git-lfs
• large image files are removed from the repository

NOTE: All PRs must follow the standard PR checklist.

[poppingtonic]

I have a public fork here and want to tackle this issue. I can't update my fork with the LFS data because of this issue

Git LFS: (0 of 534 files) 0 B / 268.10 MB                                                                                                              
batch response: @poppingtonic can not upload new objects to public fork poppingtonic/concept-to-clinic                                                 
batch response: @poppingtonic can not upload new objects to public fork poppingtonic/concept-to-clinic                                                 
batch response: @poppingtonic can not upload new objects to public fork poppingtonic/concept-to-clinic                                                 
batch response: @poppingtonic can not upload new objects to public fork poppingtonic/concept-to-clinic                                                 
batch response: @poppingtonic can not upload new objects to public fork poppingtonic/concept-to-clinic                                                 
batch response: @poppingtonic can not upload new objects to public fork poppingtonic/concept-to-clinic  

[lamby]

@poppingtonic Hey, thanks for jumping in :) I think what would be the best "next step" would be if you could get a branch / PR up and running here - that way it should smooth the permissions out, no?

[lamby]

@poppingtonic Thanks so much for this. As we can't work around the permissions I've gone ahead and done this in 7d46f08 and will credit you for the effort :)

[poppingtonic]

Thank you @lamby.