transformers

82106705 - fix: split MXFP4 dependency checks for specific error messages (#44930)

fix: split MXFP4 dependency checks for specific error messages (#44930) * fix: split MXFP4 dependency checks for specific error messages Fixes #44912. The combined `kernels_available` check made it impossible to identify which dependency (Triton vs kernels) was missing. Now each check has its own actionable message with install instructions, following the established pattern in quantizer_higgs.py. Also hardens is_triton_available() and is_kernels_available() against "N/A" version strings from _is_package_available(). * address review: revert import_utils.py changes, reduce tests to 2