[llvm] [llvm-lit] Adding -e option to lit's built-in cat command (PR #102061)

[via llvm-commits]

connieyzhu wrote:

> One question I do have is how many tests actually use this functionality and do they really need to?

@jh7370 I believe only one test currently uses cat -e. I'm not quite sure what its purpose is, but it's in [TestUseColor.test](https://github.com/llvm/llvm-project/blob/main/lldb/test/Shell/Driver/TestUseColor.test#L4) in `lldb`. 


https://github.com/llvm/llvm-project/pull/102061