ci : add LoRA test to CI (#2650)

* ci : add lora test

ggml-ci

* move lora summary to the top, add lora logs

ggml-ci

* ci : decrease CPU ppl runs to 2 to avoide 20 min timeout

ggml-ci

* add 7b lora test

use 1 thread for CUDA generation tests

ggml-ci

* add test with q8_0 (cpu only)

ggml-ci

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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>