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Update CUDA/ROCm setup tests#1899

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sstamenk wants to merge 1 commit intobitsandbytes-foundation:mainfrom
sstamenk:update_setup_tests
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Update CUDA/ROCm setup tests#1899
sstamenk wants to merge 1 commit intobitsandbytes-foundation:mainfrom
sstamenk:update_setup_tests

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@sstamenk sstamenk commented Mar 13, 2026

Updated backend-specific setup handling and tests for CUDA/ROCm library selection. The change makes get_cuda_bnb_library_path() fail fast when the wrong override variable is used (BNB_ROCM_VERSION on CUDA or BNB_CUDA_VERSION on ROCm), improves the warning/error guidance, and refreshes the evaluator tests to use BNB_BACKEND with clearer CUDA/ROCm coverage.

This PR is a subset of the changes originally proposed in #1888

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