IsEqualStateTrigger with Enum throwing FormatException at runtime

Bringing this issue from [here](https://github.com/CommunityToolkit/Labs-Windows/issues/216#issuecomment-1542604878)

I've discovered this while using `SettingsCard` and changing it's `ContentAlignment` property at runtime by editing XAML.
The `SettingsCard` uses the trigger like this:
```xaml

```

When I set that property before running the app, it works as it should.
But when I live edit it, it doesn't work and logs `FormatException`.

I found it fails here:

Two more notes:
- I didn't try binding it somewhere
- I'd say this might be occurring in other triggers too, didn't test

I'm running WindowsAppsSDK 1.3

Empieza con IsEqualStateTrigger y reproduce el escenario de SettingsCard ContentAlignment cambiando el valor de XAML en tiempo de ejecución con Windows App SDK 1.3. Rastrea la conversión del enum que produce la FormatException y comprueba si otros state triggers también la comparten. Se considera terminado cuando editar en vivo un valor de enum ya no registra la excepción y el trigger responde correctamente.

Escrito por el modelo de indexación a partir del texto del issue.