8.17.0

Included commits: 8.16.1...8.17.0

Improvements

• Introduced StockExistsProductConcreteCollectionCreateValidatorPlugin and StockExistsProductConcreteCollectionUpdateValidatorPlugin to validate warehouse (stock) names referenced in concrete product create and update requests.
• Introduced StockFacade::deleteOrphanStockProductsForProductConcrete() to clean up orphan stock assignments during concrete product updates, backed by the new StockEntityManagerInterface::deleteStockProductsExcluding().
• Introduced StockProductConcreteCollectionAfterUpdatePlugin to persist stock changes after a concrete product collection update.
• Adjusted Writer and StockProductMapper so stock assignments can be written by warehouse name.
• Introduced new transfers: ProductConcreteCollectionRequestTransfer, ProductConcreteCollectionResponseTransfer, ValidationResponseTransfer, ValidationErrorTransfer, ErrorTransfer.