[inductor] Colorization improvements for bandwidth profiler (#120343)
A couple things:
* Don't colorize output to the log file
* Don't repeatedly warn if colorama isn't installed
Differential Revision: [D54027075](https://our.internmc.facebook.com/intern/diff/D54027075/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/120343
Approved by: https://github.com/Chillee, https://github.com/shunting314
