Resolve #3479449 "No operation event instance creator"

Closes #3479449

src/Plugin/EventInstanceCreator/NoOperationEventInstanceCreator.php

+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\recurring_events\Plugin\EventInstanceCreator;
+
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\recurring_events\Entity\EventSeries;
+use Drupal\recurring_events\EventInstanceCreatorBase;
+
+/**
+ * Event instance creator plugin that does nothing.
+ *
+ * Use this plugin if you want to preserve existing event instances and not
+ * create new ones.
+ *
+ * @EventInstanceCreator(
+ *   id = "noop",
+ *   description = @Translation("Do nothing")
+ * )
+ */
+class NoOperationEventInstanceCreator extends EventInstanceCreatorBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function processInstances(EventSeries $series): void {
+  }
+
+}