Updates for ContactInfo components to utilize Prefill pattern

[adamwhitlock1]

User Story

As an engineer I want to have the ContactInfo section of the forms system updated to adhere to the Prefill Pattern

Background

The discovery document on updating ContactInfo provides background around what code needs to be updated.

Previous issue for discovery
#261

Questions to Answer

• What parts can we update, and what are breaking changes to the code / existing implementation?
• Toggle to use for this work? proposed toggle name: aedp_prefill where aedp is the prefix for any toggles that we implement. We already have aedp_VADX so this will maintain consistency

Resources

See discovery doc

Deliverables

• PR for code changes
• FE PR for adding toggle and getting initial code implemented
• BE PR to add toggle

Acceptance Criteria

• PR for changes are merged and behind a feature toggle

Constraints & Considerations

• don't want to break existing usage
• need to further document existing usage like iir and other forms and see how it is used for impacts accross the platform

Review needed by

• VA Product Owner
• Product Manager
• UX Research Team
• Engineering Team

Definition of Done

• Documentation has been updated, if applicable.
• Acceptance Criteria in related issue are met.
• Reviewers have approved.

[msbtterswrth]

We'll need to include our new updates for missing information discovery to our work here.

[adamwhitlock1]

I created the code for this, have merged it and will be going over this tomorrow in demo.

Epic #282 has also been created to track remaining work and questions around things that came up during this work.

Closing this.