Change ACA containerPort parameter to int instead of string

Today when we allocate the container port parameter for ACA apps we are using the default `typeof(string)`

https://github.com/dotnet/aspire/blob/1994993c5442cf0f2866a02b3497cf9554757add/src/Aspire.Hosting.Azure.AppContainers/ContainerAppContext.cs#L706-L731

Instead, this should be `typeof(int)`.

https://github.com/dotnet/aspire/blob/1994993c5442cf0f2866a02b3497cf9554757add/playground/AzureContainerApps/AzureContainerApps.AppHost/api.module.bicep#L8

https://github.com/dotnet/aspire/blob/1994993c5442cf0f2866a02b3497cf9554757add/playground/AzureContainerApps/AzureContainerApps.AppHost/api.module.bicep#L68

https://learn.microsoft.com/en-us/azure/templates/microsoft.app/containerapps?pivots=deployment-language-bicep#resource-format

```json
ingress: {
additionalPortMappings: [
{
exposedPort: int
external: bool
targetPort: int
}
]
```