[entity_browser] Allows selecting multiple entities despite #cardinality = 1 — either insert multiple entities or respect single cardinality

Hi,
When i work with entity_browser and entity_embed, i can select multiple entities to load in Ckeditor.
however, when I submit the entity_browser dialog after chosing my entities, entity_embed will handle the last selected entity and handle only this one.

If the entity browser allows selecting multiple entities , it must handle all of them.