Hashed storage migration path (EE version)

Merged Nick Thomas requested to merge nick.thomas/gitlab-ee:ee-hashed-storage-migration-path into master

What does this MR do?

EE version of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14067

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

The conflicts are really simple to resolve, but EE needs additional code to prevent Geo from breaking.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/3118

Edited by Nick Thomas