Fixed phpstan analysis issues and bad code that showed up with phpstan 2.0

src/Services/LabelSystem/LabelExampleElementsGenerator.php

@@ -146,11 +146,11 @@ final class LabelExampleElementsGenerator
             throw new InvalidArgumentException('$class must be an child of AbstractStructuralDBElement');
         }
 
-        /** @var AbstractStructuralDBElement $parent */
+        /** @var T $parent */
         $parent = new $class();
         $parent->setName('Example');
 
-        /** @var AbstractStructuralDBElement $child */
+        /** @var T $child */
         $child = new $class();
         $child->setName((new ReflectionClass($class))->getShortName());
         $child->setParent($parent);