Issue #3323003: Mark FailureMarker @internal and document ComposerUtility, PathLocator and ValidationResult

package_manager/src/ValidationResult.php

@@ -9,11 +9,6 @@ use Drupal\system\SystemManager;
 
 /**
  * A value object to contain the results of a validation.
- *
- * @internal
- *   This is an internal part of Package Manager and may be changed or removed
- *   at any time without warning. External code should not interact with this
- *   class.
  */
 final class ValidationResult {