Add getSuggestedUsers method in EntityWorkflowManager

Implemented the method to retrieve a list of suggested users for an entity workflow, filtering out duplicates. Added corresponding unit tests to verify the method's functionality and ensure its correctness in various scenarios.

src/Bundle/ChillMainBundle/Tests/Workflow/EntityWorkflowManagerTest.php

@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Tests\Workflow;
+
+use Chill\MainBundle\Entity\User;
+use Chill\MainBundle\Entity\Workflow\EntityWorkflow;
+use Chill\MainBundle\Workflow\EntityWorkflowHandlerInterface;
+use Chill\MainBundle\Workflow\EntityWorkflowManager;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Workflow\Registry;
+
+/**
+ * @internal
+ *
+ * @coversNothing
+ */
+class EntityWorkflowManagerTest extends TestCase
+{
+    public function testGetSuggestedUsers()
+    {
+        $user1 = new User();
+        $user2 = new User();
+        $entityWorkflow = $this->createMock(EntityWorkflow::class);
+        $entityWorkflow->method('getUsersInvolved')->willReturn([$user1, $user2]);
+
+        $user3 = new User();
+        $handler = $this->createMock(EntityWorkflowHandlerInterface::class);
+        $handler->method('getSuggestedUsers')->willReturn([$user1, $user3]);
+        $handler->method('supports')->willReturn(true);
+
+        $manager = new EntityWorkflowManager([$handler], new Registry());
+
+        $users = $manager->getSuggestedUsers($entityWorkflow);
+
+        self::assertcount(3, $users);
+        self::assertContains($user1, $users);
+        self::assertContains($user2, $users);
+        self::assertContains($user3, $users);
+    }
+}