Implement functionality to replace ticket's motive

The commit introduces several features related to ticket motive management in the Chill-TicketBundle:
- Adds capability to replace a ticket's motive with a new one.
- Provides ticket motive history management features.
- Implements relevant changes in Controller, Action Handler, and Entity levels.
- Incorporates new API endpoints and updates the API specification file for the new feature.
- Includes tests to ensure the new functionality works as expected.

src/Bundle/ChillTicketBundle/tests/Entity/TicketTest.php

@@ -0,0 +1,47 @@
+<?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\TicketBundle\Tests\Entity;
+
+use Chill\TicketBundle\Entity\Motive;
+use Chill\TicketBundle\Entity\MotiveHistory;
+use Chill\TicketBundle\Entity\Ticket;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+
+/**
+ * @internal
+ *
+ * @coversNothing
+ */
+class TicketTest extends KernelTestCase
+{
+    public function testGetMotive(): void
+    {
+        $ticket = new Ticket();
+        $motive = new Motive();
+
+        self::assertNull($ticket->getMotive());
+
+        $history = new MotiveHistory($motive, $ticket);
+        $ticket->addMotiveHistory($history);
+
+        self::assertSame($motive, $ticket->getMotive());
+        self::assertCount(1, $ticket->getMotiveHistories());
+
+        // replace motive
+        $motive2 = new Motive();
+        $history->setEndDate(new \DateTimeImmutable());
+        $ticket->addMotiveHistory(new MotiveHistory($motive2, $ticket));
+
+        self::assertCount(2, $ticket->getMotiveHistories());
+        self::assertSame($motive2, $ticket->getMotive());
+    }
+}