Add AccountType to Database

[bbengfort]

Scope of changes

Rather than hardcoding the account type as "sandbox", the account type is saved in the database. This should allow us to update Rotational employee's account type so that they have access to the "paid" version rather than the sandbox version.

Fixes SC-24990

Type of change

• new feature
• bug fix
• documentation
• testing
• technical debt
• other (describe)

Acceptance criteria

This is a tough one that could potentially inject a lot of bugs … let's read through this one carefully!

Definition of Done

• I have manually tested the change running it locally (having rebuilt all containers) or via unit tests
• I have added unit and/or integration tests that cover my changes
• I have added new test fixtures as needed to support added tests
• I have updated the dependencies list if necessary (including updating yarn.lock and/or go.sum)
• I have recompiled and included new protocol buffers to reflect changes I made if necessary
• Check this box if a reviewer can merge this pull request after approval (leave it unchecked if you want to do it yourself)
• I have notified the reviewer via Shortcut or Slack that this is ready for review
• Backend-end: Documented service configuration changes or created related devops stories

Reviewer(s) checklist

• Any new user-facing content that has been added for this PR has been QA'ed to ensure correct grammar, spelling, and understandability.
• Are there any TODOs in this PR that should be turned into stories?