[export] fix acp ReferrerScopeAggregator query + unit test

TO CHECK: logic in alterQuery. calc_date is same for 2 histories ?

src/Bundle/ChillCalendarBundle/Export/Aggregator/JobAggregator.php

@@ -72,6 +72,7 @@ final readonly class JobAggregator implements AggregatorInterface
     {
         $builder->add('job_at', PickRollingDateType::class, [
             'label' => 'export.calendar.agent_job.Calc date',
+            'required' => true,
         ]);
     }