Improve page cache invalidation for Ajax popup

When an entity is rendered inside an ajax popup after a marker is clicked, its rendered cache is not being updated properly as the only cache tag it has is http_response when page cache is active.

1. As anomymous: Click on any marker to show the information of an entity
2. As admin: change the title of the clicked entity
3. As anoymous: Reload the page and click on the same marker.
4. No changes, the rendered cache for the entity has not been invalidated as expected.