Fix bug when changing ScheduledTask in_progress field

In 3394568, SendingQueue::stopProgress() was refactored to use Doctrine
but a typo introduced a bug causing this method to set
ScheduledTaskEntity::inProgress to true instead of false:

3394568792 (diff-3a26b2d8faf9cc01efd5aef47b058c088c0de01b8074c3be7cefd9adb77fbaaaR551)

This luckly was caught by the
EditorCouponCest.php:seeNoticeWhenCouponCantGenerateAndResumeSending
acceptance test.

This commit fixes the problem and also adds two integration tests to
protect against similar regressions in the future.

[MAILPOET-5682]

mailpoet/lib/Cron/Workers/SendingQueue/SendingQueue.php

@@ -559,7 +559,7 @@ class SendingQueue {
   }
 
   private function stopProgress(ScheduledTaskEntity $task): void {
-    $task->setInProgress(true);
+    $task->setInProgress(false);
     $this->scheduledTasksRepository->flush();
   }
 

mailpoet/tests/integration/Cron/Workers/SendingQueue/SendingQueueTest.php

@@ -1393,6 +1393,31 @@ class SendingQueueTest extends \MailPoetTest {
     verify($newsletter->getStatus())->equals(NewsletterEntity::STATUS_SENDING);
   }
 
+  public function testProcessMarksScheduledTaskInProgressAsFalseWhenProperlyProcessingTask() {
+    $sendingQueueWorker = $this->getSendingQueueWorker();
+    $sendingQueueWorker->process();
+    $this->assertSame(false, $this->scheduledTask->getInProgress());
+  }
+
+  public function testProcessMarksScheduledTaskProgressAsFinishedWhenThereIsAnErrorProcessingTask() {
+    $mailerTask = $this->createMock(MailerTask::class);
+    $mailerTask
+      ->method('send')
+      ->willThrowException(new \Exception());
+    $mailerTask
+      ->method('getProcessingMethod')
+      ->willReturn('individual');
+    $sendingQueueWorker = $this->getSendingQueueWorker($mailerTask);
+
+    try {
+      $sendingQueueWorker->process();
+    } catch (\Exception $e) {
+      // do nothing
+    }
+
+    $this->assertSame(false, $this->scheduledTask->getInProgress());
+  }
+
   private function createNewsletter(string $type, $subject, string $status = NewsletterEntity::STATUS_DRAFT): NewsletterEntity {
     $newsletter = new NewsletterEntity();
     $newsletter->setType($type);