Remove deprecated syntax (#6561)

* Remove deprecated syntax

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* fix one test

* fix sketch on revolved face test

* fix test: empty-scene default-planes act as expected

* fix up more tests

* another fix

* remove another const

---------

Signed-off-by: Nick Cameron <nrc@ncameron.org>
Co-authored-by: Kurt Hutten Irev-Dev <k.hutten@protonmail.ch>

rust/kcl-lib/src/lsp/copilot/mod.rs

@@ -262,15 +262,15 @@ impl Backend {
         // if self.dev_mode
         if false {
             completion_list.push(
-                r#"fn cube = (pos, scale) => {
-  const sg = startSketchOn('XY')
+                r#"fn cube(pos, scale) {
+  sg = startSketchOn(XY)
     |> startProfile(at = pos)
     |> line([0, scale], %)
     |> line([scale, 0], %)
     |> line([0, -scale], %)
   return sg
 }
-const part001 = cube([0,0], 20)
+part001 = cube([0,0], 20)
     |> close(%)
     |> extrude(length=20)"#
                     .to_string(),