feat(entity): properly convert arrays of entities in toRawArray()

[michalsn]

Description
This PR enhances the Entity::toRawArray() method to properly handle arrays of entities when using recursive mode. Previously, entity properties containing arrays of entities were not being recursively converted, which limited the method's usefulness for complex entity hierarchies.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide