Fix scoped overlay use not finding a module (#6474)

* Add source-env test for dynamic path

* Use correct module ID for env overlay imports

* Remove parser check from "overlay list"

It would cause unnecessary errors from some inner scope if some
overlay module was also defined in some inner scope.

* Restore Cargo.lock back

* Remove comments

crates/nu-engine/src/eval.rs

@@ -355,6 +355,15 @@ pub fn eval_expression(
             value.follow_cell_path(&cell_path.tail, false)
         }
         Expr::ImportPattern(_) => Ok(Value::Nothing { span: expr.span }),
+        Expr::Overlay(_) => {
+            let name =
+                String::from_utf8_lossy(engine_state.get_span_contents(&expr.span)).to_string();
+
+            Ok(Value::String {
+                val: name,
+                span: expr.span,
+            })
+        }
         Expr::Call(call) => {
             // FIXME: protect this collect with ctrl-c
             Ok(