Break up database-services.ts to be more manageable

[robertandremitchell]

Description:

https://github.com/CDCgov/dibbs-query-connector/blob/main/query-connector/src/app/database-service.ts

This file is beginning to get unwieldy in the amount of database calls being made. More of this work should be refactored and moved to appropriate places in the workflow for ease of findability and readibility.

Acceptance Criteria:

[linear]

QUE-108 Break up `database-services.ts` to be more manageable