Add ability to update customer information on purchase flows
Problem
Address and other customer profile information are not currently editable during checkout (they are read-only). With the introduction of displaying Tax ID on checkout page - if customer doesn't add their VAT number during signup, they can't add it during checkout, and they have no way of knowing whether or not they have it set when they're in the checkout. They can go into their profile, add their VAT number, and then check out, but this process is not obvious to the customers.
Proposal
Add a small Edit
button next to the name/company/address/VAT info that takes the user to their profile
Original discussions: https://gitlab.com/gitlab-org/customers-gitlab-com/-/issues/4291#note_945161787 & https://gitlab.com/gitlab-org/customers-gitlab-com/-/issues/4291#note_1415596971