[Provisioning] Unable to force a list property to an empty list

Currently we do not really have a "official" way to assign an empty list.
If we do this:
```
var resource = new TestResource("r")
{
List = []
};
```
or
```
var resource = new TestResource("r");
resource.List.Clear();
```
the bicep produced by this resource would not have this `list` property at all.

Currently, if we want an empty list, we will have to assign it as an expression.