Remove it expansion (#2701)

* Remove it-expansion, take 2

* Cleanup

* silly update to test CI

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

@@ -21,7 +21,6 @@ fn adds_a_row_to_the_end() {
                 | lines
                 | append "pollo loco"
                 | nth 3
-                | echo $it
             "#
         ));