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a0542c19 - [LoRA] Remove legacy LoRA code and related adjustments (#8316)

[LoRA] Remove legacy LoRA code and related adjustments (#8316) * remove legacy code from load_attn_procs. * finish first draft * fix more. * fix more * add test * add serialization support. * fix-copies * require peft backend for lora tests * style * fix test * fix loading. * empty * address benjamin's feedback.