Remove usage of multiaddress delivery

[Hlavtox]

Questions	Answers
Branch?	develop
Description?	See below
Type?	refacto
Category?	CO
BC breaks?	yes - but I doubt that anybode will be affected since this feature is dead for whole lifetime of 1.7. No method signatures have been changed, all methods still return the same data. I didn't touch the structure of delivery methods etc. - they are still structured with that one single delivery address ID.
Deprecations?	yes
How to test?
Fixed ticket?
Related PRs
Sponsor company

Description

• Removes code related to a dead feature of multi-address shipping. (Order still can be split and have multiple packages - do not confuse it.)
• Delivery address is now taken from the cart everywhere and the values in cart_product and customization are ignored.
• They are initially filled with values for one more major, but deprecated.
• All the data structures have been kept the same. Customized datas are returned the same, package lists are returned the same.

Removed methods

• Cart::containsProduct
• Cart::getDeliveryAddressesWithoutCarriers

Deprecated methods

• Cart::isMultiAddressDelivery - returns false
• Cart::getAddressCollection - returns cart's delivery address or empty array
• Cart::setProductAddressDelivery - doesn't do anything, return true
• Cart::duplicateProduct - doesn't do anything, returns false, you cannot duplicate product in a cart
• Cart::setNoMultishipping - doesn't do anything
• Cart::autosetProductAddress - doesn't do anything

Removed configuration options

• PS_ALLOW_MULTISHIPPING

[MhiriFaten]

Hello @Hlavtox ,

I have checked your PR ad LGTM,
Automated tests are OK.
https://github.com/MhiriFaten/testing_pr/actions/runs/6119472501

It is QA approved ✔️

[prestonBot]

QA approved, well done! Message to the maintainers: do not forget to milestone it before the merge.

[boherm]

Thanks @Hlavtox!