ssh remoting: Enable reconnecting after connection losses (#18586)

Release Notes:

- N/A

---------

Co-authored-by: Bennet <bennet@zed.dev>

crates/remote_server/src/headless_project.rs

@@ -112,6 +112,7 @@ impl HeadlessProject {
 
         client.add_request_handler(cx.weak_model(), Self::handle_list_remote_directory);
         client.add_request_handler(cx.weak_model(), Self::handle_check_file_exists);
+        client.add_request_handler(cx.weak_model(), Self::handle_shutdown_remote_server);
 
         client.add_model_request_handler(Self::handle_add_worktree);
         client.add_model_request_handler(Self::handle_open_buffer_by_path);
@@ -335,4 +336,22 @@ impl HeadlessProject {
             path: expanded,
         })
     }
+
+    pub async fn handle_shutdown_remote_server(
+        _this: Model<Self>,
+        _envelope: TypedEnvelope<proto::ShutdownRemoteServer>,
+        cx: AsyncAppContext,
+    ) -> Result<proto::Ack> {
+        cx.spawn(|cx| async move {
+            cx.update(|cx| {
+                // TODO: This is a hack, because in a headless project, shutdown isn't executed
+                // when calling quit, but it should be.
+                cx.shutdown();
+                cx.quit();
+            })
+        })
+        .detach();
+
+        Ok(proto::Ack {})
+    }
 }