Add the option to hide both the task and command lines in the task output (#20920)

The goal is to be able to hide these lines from a task output:

```sh
⏵ Task `...` finished successfully
⏵ Command: ...
```

---------

Co-authored-by: Peter Tripp <peter@zed.dev>

crates/project/src/terminals.rs

@@ -174,6 +174,8 @@ impl Project {
                     command_label: spawn_task.command_label,
                     hide: spawn_task.hide,
                     status: TaskStatus::Running,
+                    show_summary: spawn_task.show_summary,
+                    show_command: spawn_task.show_command,
                     completion_rx,
                 });