Add test for new _Instance but removing if option is used

tests/ProxyInterfaceSourceGeneratorTests/Source/Disposable/IRevitLocationPointProxy.cs

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+namespace ProxyInterfaceSourceGeneratorTests.Source.Disposable;
+
+public partial interface IRevitLocationPointProxy : IRevitLocationPoint { }

tests/ProxyInterfaceSourceGeneratorTests/Source/Disposable/IRevitLocationProxy.cs

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+namespace ProxyInterfaceSourceGeneratorTests.Source.Disposable;
+
+public partial interface IRevitLocationProxy : IRevitLocation { }

tests/ProxyInterfaceSourceGeneratorTests/Source/Disposable/RevitLocationPointProxyExtras.cs

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+namespace ProxyInterfaceSourceGeneratorTests.Source.Disposable;
+
+
+
+public interface IRevitLocationPoint : IRevitLocation
+{
+}
+
+public interface IRevitLocationCurve : IRevitLocation
+{
+    IRevitCurve Curve { get; }
+}
+
+public class LocationPoint : Location
+{
+    public XYZ Point => throw new NotImplementedException();
+}
+public class Location : APIObject { }
+public class APIObject { }
+public class XYZ { }
+public interface IRevitLocation
+{
+}
+public interface IRevitCurve
+{
+    double Length { get; }
+}