Remove code that tries to handle ANSI escape inputs (#2189)

Syntax highlighting is broken when input contains ANSI escape characters
anyway, so there is not much point in trying to handle ANSI escapes in
input.

tests/integration_tests.rs

@@ -1419,25 +1419,6 @@ fn ansi_highlight_underline() {
         .stderr("");
 }
 
-// Ensure that ANSI passthrough is emitted properly for both wrapping and non-wrapping printer.
-#[test]
-fn ansi_passthrough_emit() {
-    for wrapping in &["never", "character"] {
-        bat()
-            .arg("--paging=never")
-            .arg("--color=never")
-            .arg("--terminal-width=80")
-            .arg(format!("--wrap={}", wrapping))
-            .arg("--decorations=always")
-            .arg("--style=plain")
-            .write_stdin("\x1B[33mColor\nColor \x1B[m\nPlain\n")
-            .assert()
-            .success()
-            .stdout("\x1B[33m\x1B[33mColor\n\x1B[33mColor \x1B[m\nPlain\n")
-            .stderr("");
-    }
-}
-
 #[test]
 fn ignored_suffix_arg() {
     bat()