[quant][pt2] Fix convert in Conv + BN + ReLU QAT fusion (#102993)
Summary:
Previously, the QAT pattern for conv + bn + relu was
not actually replaced in convert. This is because the quantized
QAT pattern used in convert doesn't actually have a relu node.
This commit adds this extra pattern in the convert path and
the numerics now match FX's.
Test Plan: python test/test_quantization.py TestQuantizePT2E.test_qat_conv_bn_relu_numerics
Reviewed By: jerryzh168
Differential Revision: D46372411
Pull Request resolved: https://github.com/pytorch/pytorch/pull/102993
Approved by: https://github.com/jerryzh168
