Fixed no onNavigate event not firing when clicked on a leaf (#34964)

Co-authored-by: Patrycja Fogelman <patrycja.fogelman@microsoft.com>

Author: fogelek

change/@fluentui-react-tree-0450fd8a-3ddf-4a34-8af5-78dc6eedac54.json

@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "Fixed no onNavigate event not firing when clicked on a leaf",
+  "packageName": "@fluentui/react-tree",
+  "email": "patrycja.fogelman@microsoft.com",
+  "dependentChangeType": "patch"
+}

packages/react-components/react-tree/library/src/components/TreeItem/useTreeItem.tsx

@@ -122,7 +122,7 @@ export function useTreeItem_unstable(props: TreeItemProps, ref: React.Ref<HTMLDi
     } else if (!isEventFromExpandIcon) {
       onClick?.(event);
     }
-    if (event.isDefaultPrevented() || itemType === 'leaf') {
+    if (event.isDefaultPrevented()) {
       return;
     }
 
@@ -134,12 +134,14 @@ export function useTreeItem_unstable(props: TreeItemProps, ref: React.Ref<HTMLDi
         target: event.currentTarget,
         type: isEventFromExpandIcon ? treeDataTypes.ExpandIconClick : treeDataTypes.Click,
       } as const;
-      props.onOpenChange?.(event, data);
-      requestTreeResponse({
-        ...data,
-        itemType,
-        requestType: 'open',
-      });
+      if (itemType !== 'leaf') {
+        props.onOpenChange?.(event, data);
+        requestTreeResponse({
+          ...data,
+          itemType,
+          requestType: 'open',
+        });
+      }
       requestTreeResponse({
         ...data,
         itemType,