Fix tooltips not showing on IconButtons (#3427)

This PR fixes tooltips not showing on `IconButton`s.

The "fix" here is the same hack that we used to fix `on_click` handlers
for `ListItem`s, where we introduce another layer of wrapping with an
element with an ID set.

This PR also adds a story for the `IconButton` so this issue can be
tested/observed in isolation.

Release Notes:

- N/A

crates/ui2/src/components/icon_button.rs

@@ -65,7 +65,8 @@ impl RenderOnce for IconButton {
             }
         }
 
-        button
+        // HACK: Add an additional identified element wrapper to fix tooltips not showing up.
+        div().id(self.id.clone()).child(button)
     }
 }