FIX test by adding returning RuleError instead of string

tests/Integration/NoGotoPhpstanRule.php

@@ -8,6 +8,7 @@
 use PhpParser\Node\Stmt\Goto_;
 use PHPStan\Analyser\Scope;
 use PHPStan\Rules\Rule;
+use PHPStan\Rules\RuleErrorBuilder;
 
 /** @implements Rule<Goto_> */
 final class NoGotoPhpstanRule implements Rule
@@ -19,6 +20,10 @@ public function getNodeType(): string
 
     public function processNode(Node $node, Scope $scope): array
     {
-        return ['goto statement is not allowed. Label: '.$node->name->toString()];
+        return [
+            RuleErrorBuilder::message('goto statement is not allowed. Label: '.$node->name->toString())
+                ->identifier('test.noGoto')
+                ->build(),
+        ];
     }
 }