[FW][FIX] website_sale_collect,*: fix flow when warehouse is set on website
When warehouse is set on website then website_sale_stock adds logic to handle out of stock products, namely preventing to sell them or adding to the cart. However, when click and collect is activated user can choose a warehouse where the product is available that is not necessarily the one set on the website. For these cases user should be capable to add products in the cart. The validation of the availability is checked later in the /checkout and /payment.
Forward-Port-Of: odoo/odoo#180754
@vchu-odoo this PR targets master and is the last of the forward-port chain.
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