[Accessibility] ToolStrip (TabStop=true) intercepts arrow keys after tab navigation, preventing TreeView from handling them (.NET 10 regression)

### .NET version .NET 11 SDK build: 11.0.100-preview.4.26211.102 ### Did it work in .NET Framework? Yes ### Did it work in any of the earlier releases of .NET Core or .NET 5+? Yes, It's a regression issue in .NET10/.NET11, cannot repro in .NET 9.0/8.0 ### Issue description When a `TreeView` is followed by a `ToolStrip` with `TabStop = true`. After cycling focus using Tab, ` TreeView` no longer receives arrow key input (e.g., Right Arrow), and the key is instead used for focus navigation. First interaction - Press Tab to focus TreeView - Press → (Right Arrow) → node expands - Press ← (Left Arrow) → node collapses Second interaction - Press Tab to move focus to ToolStrip - Press Shift+Tab to return focus to TreeView - Press → (Right Arrow) **Result:** The selected TreeNode does **not expand** and `TreeView` does **not handle the key**, but focus moves to `ToolStrip` instead https://github.com/user-attachments/assets/cf4b691a-8e6e-43e8-a344-5a24eebf0fdc ### Steps to reproduce 1. Create a WinForms .NET 10/11 app 2. Add controls in this order: - Button - TreeView (with leaf nodes) - ToolStrip with one item, set: `toolStrip1.TabStop = true;` 3. Run the app: First interaction 4. Press Tab to focus TreeView 5. Press → (Right Arrow) → node expands 6. Press ← (Left Arrow) → node collapses Second interaction 7. Press Tab to move focus to ToolStrip 8. Press Shift+Tab to return focus to TreeView 9. Press → (Right Arrow)