Check for reference alias in itemsReferencesAliases when importing order

[petitphp]

Note

Use itemsReferencesAliases to resolve product references (ID/SKU) during order import, with improved logging and comprehensive HPOS/legacy tests and fixtures.

• Orders/Import:
  • Use OrderResource::getItemsReferencesAliases() to map SF item references to WC product IDs/SKUs in Orders/Order/Products::set_products and mapping_product.
  • Include resolved reference in returned data as wc_ref; pass aliases to mapper.
  • Improve error message to show alias, original reference, and order ID.
• Tests:
  • Add HPOS and legacy tests covering alias mapping for both ID and SKU, plus unknown-alias cases preventing order creation.
  • Add order fixture files: simple-order-*-reference-alias*.json (valid and invalid for ID/SKU).
  • Fix minor test name typo in ProductFeedTest.

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