chore: major code cleanup and type safety using phpstan

src/Validator/Constraints/MandatoryAdditionalServicesSelectedValidator.php

@@ -63,7 +63,7 @@ class MandatoryAdditionalServicesSelectedValidator extends ConstraintValidator
             }
         );
 
-        if (true === empty($mandatoryAdditionalServices)) {
+        if ([] === $mandatoryAdditionalServices) {
             return;
         }