guest promotion (#3969)

Release Notes:

- Adds the ability to promote read-only guests to read-write
participants in calls

crates/vim/src/test/vim_test_context.rs

@@ -17,7 +17,6 @@ pub struct VimTestContext {
 impl VimTestContext {
     pub fn init(cx: &mut gpui::TestAppContext) {
         if cx.has_global::<Vim>() {
-            dbg!("OOPS");
             return;
         }
         cx.update(|cx| {