The way this was implemented, it also hid the section for management
of uploaded CSV files.  Further, admins might want to intentionally
switch from uploading to the data warehouse provided by Metabase to
one of their own.

This reverts commit fbaf58ad.

References: https://github.com/metabase/harbormaster/issues/5121
References: https://metaboat.slack.com/archives/C032LFJFANL/p1725296255637989