Bug 37647: Remove Text::CSV_XS import

Bug 37647: Remove Text::CSV_XS import

There is an unnecessary import that has been left over from when KBART file processing logic was being handled directly in the API controller. This patch removes that import as it is no longer needed

Test plan:
1) Look at the patch diff and confirm that the import for Text::CSV_XS has been removed

Signed-off-by: Jake Deery <jake.deery@ptfs-europe.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>