[pt2] Fix multiple races in log folder (#93407)
Summary:
There are a few races/permission errors in file creation, fixing
OSS:
1. caffe2/torch/_dynamo/utils.py, get_debug_dir: multiple process may conflict on it even it's using us. Adding pid to it
2. caffe2/torch/_dynamo/config.py: may not be a right assumption that we have permission to cwd
Test Plan: sandcastle
Differential Revision: D42905908
Pull Request resolved: https://github.com/pytorch/pytorch/pull/93407
Approved by: https://github.com/soumith, https://github.com/mlazos
