Migrate wiki images from uploads into repository
Once we support storing wiki images in the repository https://gitlab.com/gitlab-org/gitlab-ce/issues/33475 and using LFS for the images https://gitlab.com/gitlab-org/gitlab-ce/issues/43721 we should also write a migration to move existing images in the uploads folder into Git LFS.
Proposal
Automatically migrate images from uploads folder into the wiki Git repo and track as LFS objects.