Add capability to store closing motive when closing accompanying period

The commit introduces new functionality in the bundle that allows storing the closing motive when a course is closed. This is achieved by modifying the model and database schema to include a new `closingMotive` field in AccompanyingPeriodStepHistory entity.

src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod/AccompanyingPeriodStepHistory.php

@@ -59,6 +59,13 @@ class AccompanyingPeriodStepHistory implements TrackCreationInterface, TrackUpda
      */
     private string $step;
 
+    /**
+     * @ORM\ManyToOne(targetEntity=ClosingMotive::class)
+     *
+     * @ORM\JoinColumn(nullable=true)
+     */
+    private ?AccompanyingPeriod\ClosingMotive $closingMotive = null;
+
     public function getEndDate(): ?\DateTimeImmutable
     {
         return $this->endDate;
@@ -114,4 +121,16 @@ class AccompanyingPeriodStepHistory implements TrackCreationInterface, TrackUpda
 
         return $this;
     }
+
+    public function getClosingMotive(): ?AccompanyingPeriod\ClosingMotive
+    {
+        return $this->closingMotive;
+    }
+
+    public function setClosingMotive(?AccompanyingPeriod\ClosingMotive $closingMotive): self
+    {
+        $this->closingMotive = $closingMotive;
+
+        return $this;
+    }
 }