Exclude unpublished or not accessible translations

Problem/Motivation

Currently, we check the access on the target URL but not in the source translations.
When it loads a node and its translations, the entity mesh do not review if the source translation is accessible or not.

Steps to reproduce

Create a node with multiple translations.
The main one will be published and the other will remain unpublished.
Index them on entity mesh.
The translation will appear on entity mesh.

Proposed resolution

Exclude unpublished translations from entity mesh.

\Drupal\entity_mesh\Entity::processTranslatableEntity

  protected function processTranslatableEntity(TranslatableInterface $entity) {

    $translations = $entity->getTranslationLanguages();
    $langcodes = array_keys($translations);
    foreach ($langcodes as $langcode) {
       // Check if the translation is accessible.
      $translation = $entity->getTranslation($langcode);
      if ($translation instanceof EntityInterface) {
        $this->processEntityItem($translation);
      }
    }
  }