In preparation to implement 'hold for supply ILL'
This DRYs the existing functionality, meaning the new similar functionality will only be added once in the Controller::Catalogue
IMPORTANT:
The following command must only return occurrences in
Koha::Controller::Catalogue before this is pushed to main:
git grep "\->cookie(\"holdfor\")"
Signed-off-by: Jason Robb <jrobb@sekls.org>
Signed-off-by: Lisette Scheer <lisette@bywatersolutions.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>