Duplicate Cart item

[Mikearaya]

Describe the bug After adding products as a user that is not logged in and logging into an account that exists cart items added as a guest user are not merged, instead, are shown as a separate product.

To Reproduce Steps to reproduce the behavior:

1. log in using an existing user account
2. Add product to the cart
3. log out
4. login in as a guest user loginAsGuest
5. add the same product to the cart
6. log in to the user account in step one

The current result is the 2 identical products will be in the cart as a separate cart item

Expected behavior Items added into a cart as a guest user should be merged to an existing user account when a user log in.