scripts: twister: Fix trailing CR/LF at BinaryHandler logs

Fix trailing `\\r\\n` (escaped CR/LF) didn't cut off because of rstrip()
removed by #58338, so the CR/LF suffix was never found as the actual line
end was `\\r\\n\n`.

Add ANSI code sequence to `test_handlers` Twister unit test.

Signed-off-by: Dmitrii Golovanov <dmitrii.golovanov@intel.com>