[BE] f-stringify torch/ and scripts (#105538)
This PR is a follow up on the pyupgrade series to convert more strings to use f-strings using `flynt`.
- https://docs.python.org/3/reference/lexical_analysis.html#f-strings
- https://pypi.org/project/flynt/
Command used:
```
flynt torch/ -ll 120
flynt scripts/ -ll 120
flynt tools/ -ll 120
```
and excluded `collect_env.py`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/105538
Approved by: https://github.com/ezyang, https://github.com/malfet
