Geo: Move file transfer error logs into geo.log
Right now Gitlab::Geo::Transfer#log_transfer_error
on the secondary logs a spew of messages in the Rails production.log:
Gitlab::Geo::FileTransfer: Unsuccessful download: 404 Not Found
Gitlab::Geo::LfsTransfer: Unsuccessful download: 404 Not Found
Gitlab::Geo::FileTransfer: Unsuccessful download: 404 Not Found
Gitlab::Geo::FileTransfer: Unsuccessful download: 404 Not Found
Gitlab::Geo::LfsTransfer: Unsuccessful download: 404 Not Found