Add missing "VAT Number" field to customer registration page

[vovayatsyuk]

Description

This commits makes "VAT Number" field visible when customer/create_account/vat_frontend_visibility is enabled.
The code was copied from nearby address/edit.phtml template.

Manual testing scenarios

1. Enable Show VAT Number on Storefront option at Stores > Configuration > Customers > Customer Configuration > Create New Account Options > Show VAT Number on Storefront
2. Navigate to frontend and add some product to the cart.
3. Proceed to Multishipping checkout and select "Create Account" option
4. Address fields are shown but "VAT Number" field is missing.

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)

Resolved issues:

1. resolves [Issue] Add missing "VAT Number" field to customer registration page #31326: Add missing "VAT Number" field to customer registration page

Related Pull Requests

https://github.com/magento/partners-magento2ee/pull/443

[m2-assistant]

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[gabrieldagama]

@magento create issue

[gabrieldagama]

@magento run all tests

[gabrieldagama]

Hi @vovayatsyuk, thanks for contributing! We must cover such changes with automated tests, I believe MFTF would suit best in this case. Are you able to add MFTF cover to this PR?

Thanks.

[engcom-Hotel]

Hi @vovayatsyuk, I will help with the test.

[vovayatsyuk]

Thank you!

[engcom-Hotel]

@magento run all tests

[engcom-Hotel]

@magento run Functional Tests B2B, Functional Tests CE, Functional Tests EE

[magento-engcom-team]

Hi @gabrieldagama, thank you for the review.
ENGCOM-8617 has been created to process this Pull Request
✳️ @gabrieldagama, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[engcom-Alfa]

✔️ QA Passed

Manual testing scenarios

1. Enable Show VAT Number on Storefront option at Stores > Configuration > Customers > Customer Configuration > Create New Account Options > Show VAT Number on Storefront
2. Navigate to frontend and add some product to the cart.
3. Proceed to Multishipping checkout and select "Create Account" option

Before: ✖️ Address fields are shown but "VAT Number" field is missing.

After: ✔️ "VAT Number" is shown

Also, was checked in different places, with a disabled "Show VAT Number on Storefront" option and everything works as expected.

[engcom-Hotel]

@magento run all tests

[m2-assistant]

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