Add query tag in EntityUrlGenerator::getDataSets

Problem/Motivation

We wanted to modify the entities returned in \Drupal\simple_sitemap\Plugin\simple_sitemap\UrlGenerator\EntityUrlGenerator, such as a field which says "exclude from sitemap. If the entity query had a tag, we could add this condition.

Steps to reproduce

Proposed resolution

          if ($bundle_settings['index']) {
            $query = $entityTypeStorage->getQuery();
            $query->addTag('simple_sitemap');

Remaining tasks

User interface changes

API changes

Data model changes