Lookup rep and org info for next steps email

[opticbob]

Background

There are some validation issues with the interplay between the frontend and the backend for the next steps email endpoint. We are going to move from sending a rep name, address, and type to sending a entity_type and entity_id so those values can be looked up on the backend. This will make it easier to cover both selections of individuals and orgs as a whole.

Tasks

• [x] Remove representative_address, _name, and _type fields.
• [x] Add entity_type that should be validated to be individual or organization.
• [x] Add entity_id.
• [x] Use those two new fields to lookup the entities from both the legacy and accredited tables like we do in the PDF data objects.

Acceptance Criteria

• [x] Frontend payloads that match the changes above will send the next steps email from VA Notify and return a 200 status.

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How to configure this issue

1. Label with practice area (backend, frontend,ux, design, research)
2. Label for MVP work? (mvp)
3. Add an estimate
4. Attach an Epic (what body of work is this a part of?)

[opticbob]

I'm working on fixing the last test and the PR for this will be ready for review. I anticipate that happening early tomorrow morning.

[opticbob]

@holdenhinkle Has approved the PR for this. If platform hasn't approved it by 11:15 CST tomorrow I'll ping them.