Remove legacy namespace storage logic
What does this MR do and why?
Part of (Cleanup Legacy Storage): Remove move_repositor... (#33731 - closed)
Remove legacy namespace storage logic
GitLab deprecated legacy storage in 13.0 and enforced migration to the new hashed storage in 14.0.
This change cleans up the left over logic used for moving the namespaces using legacy storage to the new hashed storage.
Edited by Joe Woodward