fix: entry and display of the email address during the checkout process of an anonymous user

[SGrueber]

PR Type

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no API changes)
[ ] Build-related changes
[ ] CI-related changes
[ ] Documentation content changes
[ ] Application / infrastructure changes
[ ] Other:

What Is the Current Behavior?

If an anonymous user starts the checkout he can enter an email address.

1. The email address is not shown on any checkout page
2. If the user navigates back to the checkout address page and enters another invoice address address the email address gets lost and the user is able to place the order without email address.
3. The email address cannot be changed by the user during checkout.
4. The email address is not validated in the checkout as guest form.
5. Company address fields are not shown in the checkout address form for anonymous users.

Issue Number: Closes #1303

What Is the New Behavior?

1. The email address of an anonymous user should always be displayed as part of the invoice address, i.e. in the invoice address widget of the checkout address page, the checkout right panel and the invoice address on review/receipt/order detail page
2. The anonymous user should not be able to enter a new invoice address, he can only change his invoice address. He can enter a new shipping address if his invoice and shipping addresses are equal.
3. For anonymous users the email address should be added to the invoice address form on the checkout address page.
4. The email address is validated in the checkout as guest form.
5. Company address fields are shown in the checkout address form for anonymous users.

Besides this the company input fields are shown on the edit address form for an anonymous b2b user on checkout address page.

Does this PR Introduce a Breaking Change?

[ ] Yes
[x] No

Other Information

AB#80664

[github-actions]

Azure Demo Servers are available:

• Universal B2B
• Universal B2C

[shauke]

The ability to change the "Company Name" and "Company Name 2" is missing if guest checkout is used with B2B. 😉
Everything else looks good. 👍

[shauke]

A different shipping address cannot be removed/switched to the invoice address.
"Add Address" behaves like the "Edit Address"

[SGrueber]

The add address link is not displayed any more if an anonymous user has a differing shipping address. The select box is only shown for logged in customers because it shows customer addresses, an anonymous user has only basket addresses, so if he changes his mind and wants to deliver to his invoice address he has to reenter this address.