Remove it expansion (#2701)

* Remove it-expansion, take 2

* Cleanup

* silly update to test CI

crates/nu-cli/tests/commands/mkdir.rs

@@ -71,7 +71,6 @@ fn show_created_paths() {
              r#"
                  mkdir -s dir_1 dir_2 dir_3
                  | count
-                 | echo $it
              "#
         ));