Remove inspect_history from COPRO

[TomeHirata]

Remove inspect_history from COPRO optimizer.

Fixes #8026

[okhat]

Thank you @TomeHirata ! Why would we make inspect_history log? It's a function for printing. No one should use it if they don't want to print. Adding logging will clutter the printing with date and time.

[chenmoneygithub]

Thanks for the PR!

logger.info doesn't work well with colorful printing, and this inspect_history is mostly used for debugging, so as Omar mentioned print is the good fit. For the original issue, I think we can remove the logging completely, and we should ship your faqs.md change!

[TomeHirata]

Hi, @okhat @chenmoneygithub. Understood that format change caused by logging is a concern. The colored logging works fine, but I agree that the date and time are a bit clean.
@okhat Do you also agree that we remove this logging from COPRO completely?