Add error info to addProductsToCart mutation

[keharper]

Topic Link

https://devdocs.magento.com/guides/v2.4/graphql/mutations/add-products-to-cart.html

Description

Add error information similar to what's present on updateCartItems.

Possible solutions

Additional information

[m2-assistant[bot]]

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Add a comment to assign the issue: @magento I am working on this

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