MM-21898 - Part 1: Generate and use an interface instead of *A… (#13840)

* Generate and use an interface instead of *App

plugin/scheduler/scheduler.go

@@ -41,7 +41,7 @@ func (scheduler *Scheduler) NextScheduleTime(cfg *model.Config, now time.Time, p
 func (scheduler *Scheduler) ScheduleJob(cfg *model.Config, pendingJobs bool, lastSuccessfulJob *model.Job) (*model.Job, *model.AppError) {
 	mlog.Debug("Scheduling Job", mlog.String("scheduler", scheduler.Name()))
 
-	job, err := scheduler.App.Srv.Jobs.CreateJob(model.JOB_TYPE_PLUGINS, nil)
+	job, err := scheduler.App.Srv().Jobs.CreateJob(model.JOB_TYPE_PLUGINS, nil)
 	if err != nil {
 		return nil, err
 	}