[Bug] [Windows] Semantic description read from timepicker twice

### Description
https://github.com/microsoft/microsoft-ui-xaml/issues/8296

Semantic description is read two times from timepicker control. It should only read once.

### Steps to Reproduce

1. Run MAUI sample on Windows
2. Navigate to Semantics page
3. Turn on Narrator
4. Tab navigate to timepicker controls
5. Notice description text is read aloud twice from the control

Note: This used to also be the case for the datepicker control, but is no longer.

### Expected Behavior
Semantic description is read only once from timepicker control.

### Actual Behavior
Semantic description is read two times from timepicker control.

### Basic Information

- Version with issue:
- Last known good version:
- IDE:
- Platform Target Frameworks:
- iOS:
- Android:
- UWP:
- Android Support Library Version:
- Nuget Packages:
- Affected Devices:

> VS bug [#1775095](https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1775095)

Start by running the MAUI sample on Windows, opening the Semantics page, enabling Narrator, and tabbing to the timepicker controls. Compare the timepicker behavior with the datepicker, which reportedly no longer has the problem. Done means the timepicker's semantic description is read aloud only once.

Written by the indexing model from the issue text.