Add a test for remote tool use by the agent (#30289)

- Adds a new smoke test for the use of the read_file tool by the agent
in an SSH project
- Fixes the SSH shutdown sequence to use a timer from the app's executor
instead of always using a real timer
- Changes the main executor loop for tests to advance the clock
automatically instead of panicking with `parked with nothing left to
run` when there is a delayed task

Release Notes:

- N/A

crates/project/src/project.rs

@@ -1130,9 +1130,10 @@ impl Project {
                     cx.on_release(Self::release),
                     cx.on_app_quit(|this, cx| {
                         let shutdown = this.ssh_client.take().and_then(|client| {
-                            client
-                                .read(cx)
-                                .shutdown_processes(Some(proto::ShutdownRemoteServer {}))
+                            client.read(cx).shutdown_processes(
+                                Some(proto::ShutdownRemoteServer {}),
+                                cx.background_executor().clone(),
+                            )
                         });
 
                         cx.background_executor().spawn(async move {
@@ -1472,9 +1473,10 @@ impl Project {
 
     fn release(&mut self, cx: &mut App) {
         if let Some(client) = self.ssh_client.take() {
-            let shutdown = client
-                .read(cx)
-                .shutdown_processes(Some(proto::ShutdownRemoteServer {}));
+            let shutdown = client.read(cx).shutdown_processes(
+                Some(proto::ShutdownRemoteServer {}),
+                cx.background_executor().clone(),
+            );
 
             cx.background_spawn(async move {
                 if let Some(shutdown) = shutdown {