fix: #3610147 Add the plugin attribute class

Rajab Natshahrequested to merge
issue/entity_embed-3610147:3610147-plugin-attribute into 8.x-1.x

Issue: https://www.drupal.org/i/3610147

The entity embed display manager gets an attribute class next to the annotation, so discovery works on 11.4 and 12.

Tested on plain Drupal 11.4.8 (PHP 8.4) and 12.0.0-beta1 (PHP 8.5).

AI-Generated: Yes

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Edited by Rajab Natshah

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