NumberBox and AutoSuggestBox don't respect IsTabStop="False"

### Describe the bug

Certain controls, including but possibly not limited to the NumberBox and the AutoSuggestBox (and *not* TextBox), fail to respect IsTabStop="False", and will remain as a tab stop.

### Steps to reproduce the bug

1. Create a NumberBox or TextBox with `IsTabStop="False"` specified in XAML
2. Create an element that is a tab stop before this element's effective TabIndex
3. Focus the "before" element and press "tab"
4. See that the element with `IsTabStop="False"` is functioning as a tab stop

### Expected behavior

Elements with `IsTabStop="False"` should not get focus while `IsTabStop` is `false` when the user presses the "Tab" key.

### Screenshots


### NuGet package version

WinUI 3 - Windows App SDK 1.6.5: 1.6.250205002

### Windows version

Windows 11 (23H2): Build 22631

### Additional context

Minimal reproducable example available at https://github.com/jb-bcl/repro/tree/main/WinUI3_AsbAndNumberBoxNotRespectingTabStopFalse

Start with the linked minimal reproducible example and reproduce the tab-navigation behavior using NumberBox and AutoSuggestBox with IsTabStop="False". Trace how these controls participate in keyboard focus traversal, then verify that pressing Tab skips them while the property is false.

Written by the indexing model from the issue text.