Notify about broken task file contents (#27185)

Closes https://github.com/zed-industries/zed/issues/23783


https://github.com/user-attachments/assets/df019f68-a76b-4953-967a-a35ed21206ab

Release Notes:

- Added notifications when invalid tasks.json/debug.json is saved

crates/paths/src/paths.rs

@@ -342,6 +342,14 @@ pub fn local_vscode_tasks_file_relative_path() -> &'static Path {
     Path::new(".vscode/tasks.json")
 }
 
+pub fn debug_task_file_name() -> &'static str {
+    "debug.json"
+}
+
+pub fn task_file_name() -> &'static str {
+    "tasks.json"
+}
+
 /// Returns the relative path to a `launch.json` file within a project.
 pub fn local_debug_file_relative_path() -> &'static Path {
     Path::new(".zed/debug.json")