InitAPIServices sets up a new APIServices instance.

NOTE: these 2 vars are set during compilation in gitlab CI build (see Makefile).

APIServices contains any services that HTTP handlers would want to use, like logging/config reading.

Here we really just expose some test helpers.

ExportZipper - Interface for creating an export zip file.

IDGenerator - Generates ID strings.

IJWTReader - User ID getter from HTTP request.

URLSigner - Generates AWS S3 signed URLs.