[llvm] [llvm-lit] Process ANSI color codes in test output when formatting (PR #106776)

[Henrik G. Olsson via llvm-commits]

hnrklssn wrote:

> Overall this makes sense to me just a few stylistic comments.

Cool, I've inlined most of the functions and switched to find + slice based parsing instead of regex.

https://github.com/llvm/llvm-project/pull/106776