Removes hardcoded references to country selector component

[krzksz]

Description (*)

This change is aimed to fix #22416 and loosen up the coupling between shipping and country selector components in case they are moved around in the hierarchy. Applying this patch makes it possible to at least change their paths through component configuration.

Additionally, region and postcode components were refactored a bit to simplify how validation logic is written.

Fixed Issues (if relevant)

1. Coupling beetwen Magento_Checkout::js/view/shipping.js:validateShippingInformation() and layout definition or view.  #22416: Coupling beetwen Magento_Checkout::js/view/shipping.js:validateShippingInformation() and layout definition or view.

Manual testing scenarios (*)

1. Go to the checkout.
2. Switch through different countries through select input.
3. Make sure that region and postcode fields retain their validation for selected countries.

Questions or comments

This chain is meant purely to improve developer experience when adjusting the checkout structure and shouldn't change any of the business logic.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[m2-assistant]

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[VladimirZaets]

Hi @krzksz. Thanks for collaboration. Please take a look at failed tests.

[krzksz]

@magento give me 2.3-develop instance

[magento-engcom-team]

Hi @krzksz. Thank you for your request. I'm working on Magento 2.3-develop instance for you

[magento-engcom-team]

Hi @krzksz, here is your Magento instance.
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Login: admin Password: 123123q
Instance will be terminated in up to 3 hours.

[VladimirZaets]

@magento run all tests

[magento-engcom-team]

Hi @VladimirZaets, thank you for the review.
ENGCOM-6389 has been created to process this Pull Request

[engcom-Alfa]

✔️ QA Passed

[m2-assistant]

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