inject dependencies into JobSchedulerQueue

Problem/Motivation

phpstan reports, among other things,

------ ------------------------------------------------------------------------------
Line src/Plugin/QueueWorker/JobSchedulerQueue.php
------ ------------------------------------------------------------------------------
43 \Drupal calls should be avoided in classes, use dependency injection instead
44 \Drupal calls should be avoided in classes, use dependency injection instead
------ ------------------------------------------------------------------------------

Steps to reproduce

phpstan analyse -l0 job_scheduler

Proposed resolution

Implement ContainerFactoryPluginInterface.

Remaining tasks

make an MR