[Tests] add: test to check 8bit bnb quantized models work with lora loading. (#10576)
* add: test to check 8bit bnb quantized models work with lora loading.
* Update tests/quantization/bnb/test_mixed_int8.py
Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>
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Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>