Prevent pip "rich" ouput

[Klaim]

The goal here is to help with #3576 , although there might be other issues behind it.

If someone reading this know some other flags/env-vars we could use to obtain a pure json utf-8 output, feel free to add suggestions 👍🏽

[wolfv]

Usually rich / pip should implement the isatty kind of detection to figure out wether to print colors or not. However, it could indeed be the case that someone adds an env var that forces colors for pip which would make this crash.

You could also be more aggressive about running in a pristine environment.

Just some thoughts :)

[Klaim]

I reproduced the issue from #3576 by running the command with FORCE_COLOR=1. It seems that NO_COLOR=1 is not enough to prevent the parsing failure in that context even if the color is indeed removed. So the best solution so far that works locally is to unset FORCE_COLOR for the time of the call.

[Hind-M]

Can you also please rebase on main?