ai_content_suggestions - issue while adding blocks on landing pages

Problem/Motivation

Error: Call to undefined method Drupal\layout_builder\Form\AddBlockForm::getEntity() in Drupal\ai_content_suggestions\AiContentSuggestionsFormAlter->alter() (Zeile 40 in /mnt/www/html/syngentacpd901dev/docroot/modules/contrib/ai/modules/ai_content_suggestions/src/AiContentSuggestionsFormAlter.php).

Steps to reproduce (required for bugs, but not feature requests)

1. Create landing page
2. Add CTA blocks on that page

Proposed resolution

The error occurs because the code assumes all form objects have the getEntity() method, but AddBlockForm from Layout Builder doesn't.

1. Added a check to verify if the form object implements ContentEntityFormInterface
2. Skip the current iteration if it's not a content entity form
3. Added proper type checking before calling getEntity()

Remaining tasks

Optional: Other details as applicable (e.g., User interface changes, API changes, Data model changes)