Extract workflow step updating to a separate controller

[MAILPOET-4515]

mailpoet/lib/Automation/Engine/Builder/UpdateStepsController.php

@@ -0,0 +1,28 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\Automation\Engine\Builder;
+
+use MailPoet\Automation\Engine\Workflows\Step;
+use MailPoet\Automation\Engine\Workflows\Workflow;
+
+class UpdateStepsController {
+  public function updateSteps(Workflow $workflow, array $data): Workflow {
+    $steps = [];
+    foreach ($data as $stepData) {
+      $step = $this->processStep($stepData);
+      $steps[$step->getId()] = $step;
+    }
+    $workflow->setSteps($steps);
+    return $workflow;
+  }
+
+  private function processStep(array $data): Step {
+    return new Step(
+      $data['id'],
+      $data['type'],
+      $data['key'],
+      $data['next_step_id'] ?? null,
+      $data['args'] ?? null
+    );
+  }
+}