func_adl_xAOD code generator should return a science imaeg

[gordonwatts]

Story

As a codegenerator for xAOD I want to specify the science image so I can allow more advanced use of science images

Assumptions

1. The science image is one that we will allow running.
2. New version of codegen library is released with this MR

Acceptance Criteria

The xAOD code generator will use func adl to specify what science image should run the request.