remove old quantization tool file (#19247)

### Description
<!-- Describe your changes. -->
remove old python files


### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
We have a new op MatMulNBits and this one is deprecated.

onnxruntime/python/tools/quantization/__init__.py

@@ -5,7 +5,6 @@
     MinMaxCalibrater,
     create_calibrator,
 )
-from .matmul_weight4_quantizer import MatMulWeight4Quantizer  # noqa: F401
 from .qdq_quantizer import QDQQuantizer  # noqa: F401
 from .quant_utils import QuantFormat, QuantType, write_calibration_table  # noqa: F401
 from .quantize import DynamicQuantConfig  # noqa: F401