Refactor oligo handling to preserve output directory order name

[Qrouger]

Problem :
Generate complex containing homo-oligomer create a randomly output name.
exemple :
Input : P15076:5;P33790
Possible output name directory : P15076_homo_5er_and_P33790 or P33790_and_P15076_homo_5er

Cause :
Create a set() randomly reorganising protein order.

Patch :
Replace set() by list(dict.fromkeys())

[DimaMolod]

thanks @Qrouger
I checked the AF3 side: build_af3_combined_json_job_name in alphapulldown/utils/output_paths.py is already order-preserving, so only this branch needs fixing.