In #2728 and 55b9a4e we decided to allow server side operations
between google drives with different configurations.
This works in some cases (eg between teamdrives) but does not work in
the general case, and this caused breakage in quite a number of
people's workflows.
This change makes the feature conditional on the
--drive-server-side-across-configs flag which defaults to off.
See: https://forum.rclone.org/t/gdrive-to-gdrive-error-404-file-not-found/9621/10Fixes#3119