Change Identifier from "productList*" to "cart*"

## What are the schemas that are affected by the issue
/commerce
## What are examples of products that are impacted by the issue
In chasing down a blocking issue raised by the Campaign team, the root issue came down to the fact that the commerce fields the user was looking for was labeled "productListAdds" rather than "cartAdds"
The overwhelming majority of customers--even those outside of retail verticals--are more familiar with the concept of "cart" than that of "product list." We already have one field named "cartAbandons" in the same section. Both "cartAbandons" and "productListAdds" refer to the cart. Request we consolidate on "cart"

Start with the /commerce schema and search the repository for productList* and cartAbandons to identify the affected definitions and references. Confirm the intended cart naming for each matching field and update the schema consistently; done means the affected commerce identifiers use cart terminology without breaking related schema references.

Written by the indexing model from the issue text.