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a8c33fe9 - refactor lumina2 pipeline tests to the new mixin structure (#14629)

refactor lumina2 pipeline tests to the new mixin structure (#14629) * refactor lumina2 pipeline tests to the new mixin structure * move lumina2 lora tests to the pipeline-level mixins --------- Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>