Remove it expansion (#2701)

* Remove it-expansion, take 2

* Cleanup

* silly update to test CI

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

@@ -34,7 +34,6 @@ fn row() {
                 | where country in ["Guayaquil Ecuador" "New Zealand"]
                 | get luck
                 | math sum
-                | echo $it
                 "#
         ));