Add and update test handlers for suggested users retrieval

Introduced new test files for workflow handlers and adjusted existing `getSuggestedUsers` methods to handle related entity checks and duplicates removal. Also, modified repos to align with test dependencies.

src/Bundle/ChillPersonBundle/Workflow/AccompanyingPeriodWorkWorkflowHandler.php

@@ -87,17 +87,32 @@ readonly class AccompanyingPeriodWorkWorkflowHandler implements EntityWorkflowHa
 
     public function getSuggestedUsers(EntityWorkflow $entityWorkflow): array
     {
-        $suggestedUsers = $entityWorkflow->getUsersInvolved();
+        $related = $this->getRelatedEntity($entityWorkflow);
 
-        $referrer = $this->getRelatedEntity($entityWorkflow)
-            ->getAccompanyingPeriod()
-            ->getUser();
-
-        if (null !== $referrer) {
-            $suggestedUsers[spl_object_hash($referrer)] = $referrer;
+        if (null === $related) {
+            return [];
         }
 
-        return $suggestedUsers;
+        $users = [];
+        if (null !== $referrer = $related->getAccompanyingPeriod()
+            ->getUser()
+        ) {
+            $users[] = $referrer;
+        }
+
+        foreach ($related->getReferrersHistoryCurrent() as $referrerHistory
+        ) {
+            $users[] = $referrerHistory->getUser();
+        }
+
+        return array_values(
+            // filter objects to remove duplicates
+            array_filter(
+                $users,
+                fn ($o, $k) => array_search($o, $users, true) === $k,
+                ARRAY_FILTER_USE_BOTH
+            )
+        );
     }
 
     public function getTemplate(EntityWorkflow $entityWorkflow, array $options = []): string