ssh-remoting: Fix go to definition out of worktree (#18094)

Release Notes:

- ssh-remoting: Fixed go to definition outside of worktree

---------

Co-authored-by: Mikayla <mikayla@zed.dev>

crates/rpc/src/proto_client.rs

@@ -27,6 +27,8 @@ pub trait ProtoClient: Send + Sync {
     fn send_response(&self, envelope: Envelope, message_type: &'static str) -> anyhow::Result<()>;
 
     fn message_handler_set(&self) -> &parking_lot::Mutex<ProtoMessageHandlerSet>;
+
+    fn goes_via_collab(&self) -> bool;
 }
 
 #[derive(Default)]
@@ -139,6 +141,10 @@ impl AnyProtoClient {
         Self(client)
     }
 
+    pub fn goes_via_collab(&self) -> bool {
+        self.0.goes_via_collab()
+    }
+
     pub fn request<T: RequestMessage>(
         &self,
         request: T,