Optimize color detection and add WSL support #14603
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This PR fixes an issue where Helix would not correctly detect color support on Windows when run inside WSL, and optimizes color detection by using
std::env::var_os()to skip unnecessary UTF-8 checks and conversions. I know that checking forWSL_DISTRO_NAMEas the way to check for WSL looks kinda silly, but it is by far the most straightforward way that's supported in both WSL1 and WSL2.