Commerce product/variation circular dependency makes default_content export unimportable

Describe your bug or feature request.

When exporting a commerce_product and its associated commerce_product_variation entities using the Default Content API in Drupal Core, the resulting YAML files contain a circular dependency that makes import impossible:
- commerce_product has a variations field referencing its variation entities
- commerce_product_variation has a product_id back-reference to its parent product

The exported YAML for each entity contains a depends key listing the UUIDs of referenced entities. Because both entities reference each other, neither can be imported first - Drupal's importer cannot resolve the dependency graph and the import fails.

This is not specific to Commerce. Any entity type pair that holds bidirectional references (owner → child, child → parent back-reference) will produce the same unresolvable cycle.

Workaround

Manually edit the exported YAML for the "child" entity to remove the back-reference field and its depends entry:

  # commerce_product_variation/<uuid>.yml — remove:
  product_id:
    - target_uuid: <product-uuid>

  # and remove the product UUID from the depends block:
  depends:
    - <product-uuid>   # ← remove this line