The entity getCreatedTime() and getRevisionCreationTime() methods now correctly return an integer instead of a string

The following methods now correctly return an integer instead of a string, matching the previously existing return type hints documented by their interfaces:

• Drupal\Core\Entity\RevisionLogEntityTrait::getRevisionCreationTime()
• Drupal\comment\Entity\Comment::getCreatedTime()
• Drupal\content_translation\ContentTranslationMetadataWrapper::getCreatedTime()
• Drupal\media\Entity\Media::getCreatedTime()
• Drupal\node\Entity\Node.php::getCreatedTime()
• Drupal\user\Entity\User::getCreatedTime()
• Drupal\workspaces\Entity\Workspace::getCreatedTime()

Before:

  public function getCreatedTime() {
    if (isset($this->get('created')->value)) {
      return $this->get('created')->value;
    }
    return NULL;
  }

After:

  public function getCreatedTime() {
    $value = $this->get('created')->value;
    return isset($value) ? (int) $value : NULL;
  }