[quant][pt2e] Fix annotation for conv no bias case (#107971)
Summary: This fixes the no bias case for conv annotations.
Previously this would result in an index out of bounds, since
the new aten.conv2d op may not have the bias arg (unlike the
old aten.convolution op). This was not caught because of a lack
of test cases, which are added in this commit.
Test Plan:
python test/test_quantization.py TestQuantizePT2E.test_qat_conv_no_bias
python test/test_quantization.py TestQuantizePT2E.test_qat_conv_bn_relu_fusion_no_conv_bias
Reviewers: jerryzh168, kimishpatel
Subscribers: jerryzh168, kimishpatel
Differential Revision: [D48696874](https://our.internmc.facebook.com/intern/diff/D48696874)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/107971
Approved by: https://github.com/jerryzh168
