Fix class name resolution for self & static

C.f. phpstan/phpstan#10369 (comment)

Was throwing errors:
- Class self was not found while trying to analyse it
- Class static was not found while trying to analyse it

Author: ebln

src/ForceFactoryRule.php

@@ -161,7 +161,7 @@ private function getFactoriesFromAttributeByClass(\ReflectionClass $reflection):
     private function getClassNames(\PhpParser\Node $node, \PHPStan\Analyser\Scope $scope): array
     {
         if ($node->class instanceof \PhpParser\Node\Name) {
-            return [[(string)$node->class, \true]];
+            return [[$scope->resolveName($node->class), \true]];
         }
         if ($node->class instanceof \PhpParser\Node\Stmt\Class_) {
             $classNames = $scope->getType($node)->getObjectClassNames();

tests/dataAttrib/EmptyFactory.php

@@ -6,10 +6,20 @@
 
 use Test\Ebln\PHPStan\EnforceFactory\dataAttrib\code\EmptyProduct;
 
-class EmptyFactory
+final class EmptyFactory
 {
     public function class(): EmptyProduct
     {
         return new EmptyProduct();
     }
+
+    public static function createSelf(): self
+    {
+        return new self();
+    }
+
+    public static function createStatic(): static
+    {
+        return new static();
+    }
 }

tests/dataAttrib/code/FreeProduct.php

@@ -6,5 +6,4 @@
 
 class FreeProduct
 {
-
 }