Bail and signal error when the cwd of a resolved task doesn't exist (#32777)

Closes #32688

Release Notes:

- Fixed tasks (including build tasks for debug configurations) silently
using `/` as a working directory when the specified `cwd` didn't exist.

crates/debugger_ui/src/session/running.rs

@@ -850,9 +850,18 @@ impl RunningState {
                         (task, None)
                     }
                 };
-                let Some(task) = task_template.resolve_task("debug-build-task", &task_context) else {
+                let Some(task) = task_template.resolve_task_and_check_cwd("debug-build-task", &task_context, cx.background_executor().clone()) else {
                     anyhow::bail!("Could not resolve task variables within a debug scenario");
                 };
+                let task = match task.await {
+                    Ok(task) => task,
+                    Err(e) => {
+                        workspace.update(cx, |workspace, cx| {
+                            workspace.show_error(&e, cx);
+                        }).ok();
+                        return Err(e)
+                    }
+                };
 
                 let locator_name = if let Some(locator_name) = locator_name {
                     debug_assert!(!config_is_valid);