This patch changes the test that uses the `cat -e` option to `cat -v` so
that the test can be run using lit's internal shell. For `cat`, the `-v`
option prints non-printing characters in ^ and M- notation, while the
`-e` option adds `$` to the end of lines in addition to printing
non-printing characters in ^ and M- notation. This is an alternative
patch to https://github.com/llvm/llvm-project/pull/102061, opting to
rewrite the test that uses `cat -e` instead of extending support to the
`-e` option.

Fixes https://github.com/llvm/llvm-project/issues/102377

Color the error: and warning: part of the CommandReturnObject output,
similar to how an error is printed from the driver when colors are
enabled.

Differential revision: https://reviews.llvm.org/D81058