Bug 32561: Prevent worker to run with unecessary modules in memory

Bug 32561: Prevent worker to run with unecessary modules in memory

Regression of bug 28413, bug 30410 added a "use Koha::Plugins" statement at the top of Koha::BackgroundJob, and so all Koha module are loaded by the worker on startup.

See bug 28413 for more info

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit a85a6bc4d4a1c15a065dc8b188d6de0c23f99271)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>