`TextCommandBarFlyout` phase II

### What would you like to be added? 💡

- [ ] Find a proper way to avoid `EnsureVisualTreeOnSubtree` on popup
- [ ] Avoid `TextCommandBarFlyout` workaround in `src/Uno.UI/UI/Xaml/IFrameworkElement.cs`

### Why is this needed? 🤔

_No response_

### Renderer 🎨

- [ ] Skia
- [ ] Native

### For which platforms 📱💻🖥️

_No response_

### Anything else we need to know? 💬

_No response_