[IMP] product,(website_)sale: Product configurator default_get cleanup

Targets commit d3530eb0

Purpose
=======

[Follow up AL review]
Removed the default_get override in the sale_order_line model.
- The default values to create records are now specified by pefixing them with "default_" in the JS.
  That will use the built-in framework method, which is more simple/clean.

- The "list_editable_renderer.js" file for the product configurator was removed and its content is now merged within
  the SectionAndNoteListRenderer.

Updated fields:

- [sale_order_line in sale/sale.py] "product_no_variant_attribute_values" to "product_no_variant_attribute_value_ids"