[FIX] product: fix _name_search to include dynamic product variants
[FIX] product: fix _name_search to include dynamic product variants

Targets commit d3530eb07e24278117ab396ecb86a59deecc312d

Purpose
=======
- The _name_search of product.template fallbacks by default on product.product
  In case there are no product.products yet (dynamic product variants configuration), we need to
  include the base product.template _name_search in the results
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