nazca #283010 PipelineAligner should stick to BaseAligner API [in-progress]

BaseAligner.get_aligned_pairs() returns a list of triplets (ref_item, target_item, distance) whereas PipeAligner.get_aligned_pairs() returns (ref_item, target_item).

prioritynormal
typebug
done in<not specified>
closed by<not specified>
patchStandardize get_aligned_pairs() API for PipelineAligner (closes #283010) [in-progress]