Can not overwrite the `CheckBoxSize` or `CheckBoxGlyphSize` for CheckBoxSize

### Describe the bug

Can not change the CheckGlyph size by overwritting the `CheckBoxSize` or `CheckBoxGlyphSize` resource, because they are assigned via `StaticResource` : https://github.com/microsoft/microsoft-ui-xaml/blob/589ced40542b9b4de2fddf0e58a1e3eecd164e2f/src/controls/dev/CommonStyles/CheckBox_themeresources.xaml#L602。

### Steps to reproduce the bug

```xaml

8
8

```

### Expected behavior

_No response_

### Screenshots

_No response_

### NuGet package version

WinUI 3 - Windows App SDK 1.6.5: 1.6.250205002

### Windows version

_No response_

### Additional context

_No response_

Start in src/controls/dev/CommonStyles/CheckBox_themeresources.xaml at the referenced line where the checkbox glyph sizing resources are assigned. Reproduce the issue with the provided XAML in a WinUI 3 app, then verify that local CheckBoxSize and CheckBoxGlyphSize resources control the rendered glyph size as intended.

Written by the indexing model from the issue text.