Refactor away unnecessary pipeline methods

[SamuelBrand1]

Generally, our pattern has been to control pipeline behaviour with methods dispatching on pipeline type. This is fine IMO, but as we've developed its become clear that we can control things without as many methods. For example, generate_inference_results: with a small refactor we don't need this to dispatch directly on pipeline type because the underlying function chooses its behaviour on pipeline dispatch.

This is low priority but IMO worth flagging.

[SamuelBrand1]

I think #295 has closed this.