Rework `\Drupal\entity_embed\Controller\EditEmbeddedEntity::edit()` to get...

Seth Hillrequested to merge
issue/entity_embed-3416512:3416512-route-validation-paragraphs into 8.x-1.x

Rework \Drupal\entity_embed\Controller\EditEmbeddedEntity::edit() to get prepared for various entity types

Closes #3416512

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