Revert "FEATURE: Support backup uploads/downloads directly to/from S3."

This reverts commit c29a4dddc1.

We're doing a beta bump soon so un-revert this after that is done.

lib/json_error.rb

@@ -24,12 +24,6 @@ module JsonError
     # If we're passed an array, it's an array of error messages
     return { errors: obj.map(&:to_s) } if obj.is_a?(Array) && obj.present?
 
-    if obj.is_a?(Exception)
-      message = obj.cause.message.presence || obj.cause.class.name if obj.cause
-      message = obj.message.presence || obj.class.name if message.blank?
-      return { errors: [message] } if message.present?
-    end
-
     # Log a warning (unless obj is nil)
     Rails.logger.warn("create_errors_json called with unrecognized type: #{obj.inspect}") if obj