OOTB: Remove conditional compilation and model dependency from `ecs-settings-applier`

[zmrow]

Currently the program is conditionally compiled based on the orchestrator (ECS). It also makes calls to the API and pulls the entire set of settings from the model - which will need to change for OOTB.

• [ ] Remove the conditional compilation directives and exclude the package from non-ECS variants
• [ ] Remove the model dependency (probably read from a file rendered by schnauzer)