dbr quant: clean up logging format (#70114)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70114
This PR makes the debug logging for DBR quant be more useful
and easier to read.
New format looks like
```
DEBUG:auto_trace: fqn: _tf_ <function tanhshrink at 0x7fa4d02d4790> out torch.float32 end
```
This will be useful to speed up further work.
Test Plan:
```
// run this with logging enabled, logs easier to read
python test/test_quantization.py TestQuantizeDBR
```
Reviewed By: jerryzh168
Differential Revision: D33189545
Pulled By: vkuzo
fbshipit-source-id: 20af7e066e710beac5a3871a9d6259ee5518f97d
