Fix non-zero exit code errors in middle of pipeline (#13899)

# Description
Fixes #13868. Should come after #13885.

# User-Facing Changes
Bug fix.

# Tests + Formatting
Added a test.

tests/shell/pipeline/mod.rs

@@ -6,6 +6,14 @@ use pretty_assertions::assert_eq;
 #[test]
 fn doesnt_break_on_utf8() {
     let actual = nu!("echo ö");
-
     assert_eq!(actual.out, "ö", "'{}' should contain ö", actual.out);
 }
+
+#[test]
+fn non_zero_exit_code_in_middle_of_pipeline_ignored() {
+    let actual = nu!("nu -c 'print a b; exit 42' | collect");
+    assert_eq!(actual.out, "ab");
+
+    let actual = nu!("nu -c 'print a b; exit 42' | nu --stdin -c 'collect'");
+    assert_eq!(actual.out, "ab");
+}