fix: add fallback for 'getBundleEntity' call on Drupal 10

Jelle Glebbeekrequested to merge
issue/search_api_vragen_ai-3582197:3582197-contententityinterfacegetbundleentity-is-not into 2.0.x

Manually resolves the entity bundle on older Drupal versions. Used the DeprecationHelper for switching the implementations.

Closes #3582197

Edited by Jelle Glebbeek

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