Remove bundle usage if core patch 2987537 applied

There are multiple issues open in core related to the bundle key in the menu link content entity. Some seek to retain the bundle key and others remove it. This issue is intended to go hand-in-hand with the MR against https://www.drupal.org/project/drupal/issues/2987537 📌 Custom menu link entity type should not declare "bundle" entity key Needs work , removing the bundle key use from menu_item_extras and addressing the warnings that result if that MR is applied.