Settings/keymap backup path next to files + update notification messages (#24517)

Before:


![image](https://github.com/user-attachments/assets/5b7d8677-b0db-4a66-ac30-e4751ba4182d)

After:


![image](https://github.com/user-attachments/assets/94743bc2-2902-43a3-8d6e-e0e0e6e469ec)

Release Notes:

- N/A

crates/workspace/src/notifications.rs

@@ -448,6 +448,14 @@ pub mod simple_message_notification {
             self
         }
 
+        pub fn primary_on_click_arc<F>(mut self, on_click: Arc<F>) -> Self
+        where
+            F: 'static + Fn(&mut Window, &mut Context<Self>),
+        {
+            self.primary_on_click = Some(on_click);
+            self
+        }
+
         pub fn secondary_message<S>(mut self, message: S) -> Self
         where
             S: Into<SharedString>,
@@ -474,6 +482,14 @@ pub mod simple_message_notification {
             self
         }
 
+        pub fn secondary_on_click_arc<F>(mut self, on_click: Arc<F>) -> Self
+        where
+            F: 'static + Fn(&mut Window, &mut Context<Self>),
+        {
+            self.secondary_on_click = Some(on_click);
+            self
+        }
+
         pub fn more_info_message<S>(mut self, message: S) -> Self
         where
             S: Into<SharedString>,