Add new components for contact info

What does this MR do and why?

Related to #433384 (closed) | Designs: Design link

When the key_contacts_management feature flag is enabled and the customer has a billing account, we will show the billing&subscription contact information in the Contact information step instead of just the notice. This introduces components needed to do so.

Consumption MR: Display billing address in GitLab.com purchase ... (!139857 - merged)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

N/A, components to be consumed in Display billing address in GitLab.com purchase ... (!139857 - merged)

How to set up and validate locally

CI passing

Related to #433384 (closed)