Show Zoom In/Out shortcuts in the labels (#10604)

Based on https://github.com/zed-industries/zed/discussions/10599 
Does the same as the assistant tab with the Zoom In/Out labels.


![image](https://github.com/zed-industries/zed/assets/2690773/afc59a3e-c3df-4fc8-bcaf-1d45a21aecf7)

Release Notes:

- Adjusted Zoom In/Out for Pane and Terminal Pane to show keybinding
labels

crates/workspace/src/pane.rs

@@ -365,7 +365,11 @@ impl Pane {
                                 pane.toggle_zoom(&crate::ToggleZoom, cx);
                             }))
                             .tooltip(move |cx| {
-                                Tooltip::text(if zoomed { "Zoom Out" } else { "Zoom In" }, cx)
+                                Tooltip::for_action(
+                                    if zoomed { "Zoom Out" } else { "Zoom In" },
+                                    &ToggleZoom,
+                                    cx,
+                                )
                             })
                     })
                     .when_some(pane.split_item_menu.as_ref(), |el, split_item_menu| {