[torch.ao.quantization] include torch.qint32 for static quant (#86345)
Summary: include `torch.qint32` to `activation_is_statically_quantized` and `get_quant_type` so that fakequantize with `dtype=torch.qint32` won't be skipped
Test Plan: updated `test_custom_module_class`
Differential Revision: D40128178
Pull Request resolved: https://github.com/pytorch/pytorch/pull/86345
Approved by: https://github.com/jerryzh168
