Resolve #3408488 "Make unknownpathexcluder accept"

Closes #3408488

package_manager/src/Plugin/Validation/Constraint/RelativePathConstraintValidator.php

@@ -7,7 +7,6 @@ use PhpTuf\ComposerStager\API\Path\Factory\PathFactoryInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
-use Symfony\Component\Validator\Exception\UnexpectedTypeException;
 
 /**
  * Validates that a value is a relative path that may or may not exist.
@@ -38,14 +37,11 @@ final class RelativePathConstraintValidator extends ConstraintValidator implemen
    */
   public function validate(mixed $value, Constraint $constraint): void {
     assert($constraint instanceof RelativePathConstraint);
+    assert(is_string($value));
 
-    if (is_string($value)) {
-      if ($this->pathFactory->create($value)->isAbsolute()) {
-        $this->context->addViolation($constraint->message, ['value' => $value]);
-      }
-      $value = $this->pathFactory->create($value);
+    if ($this->pathFactory->create($value)->isAbsolute()) {
+      $this->context->addViolation($constraint->message, ['value' => $value]);
     }
-    throw new UnexpectedTypeException($value, 'string');
   }
 
 }