Revert "Decouple workspace from call (#3380)"

This reverts commit 6da57cbc6e, reversing
changes made to 62b1843704.

Also, adjust new code that was written using the "call handler".

crates/zed2/src/main.rs

@@ -191,7 +191,6 @@ fn main() {
             user_store: user_store.clone(),
             fs,
             build_window_options,
-            call_factory: call::Call::new,
             workspace_store,
             node_runtime,
         });