skip dynamic shape test for test_conv_bn_fuse (#108113)
For test_conv_bn_fuse dynamic case, we always fuse bn with convolution and there only a external convolution call, not loops, so it will failed when we do a dynamic loop vars check. This PR will skip this case.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/108113
Approved by: https://github.com/huydhn
