DeterminesOutputType and AutoCreateRefTerm are not compatible

The issue is due to the UK2Node_PureAssignmentStatement node that's created during node expansion when AutoCreateRefTerm is used on the target function. In the attached DOTBug image, you can see that this node's return value does not correspond to the derived type specified in the Value field.

Essentially, we need to propagate DeterminesOutputType support to the assignment node, which should ensure that it has the correct return value type.

1. Download and unzip attached project.
2. Run editor.
3. Open BP_TestActor.
4. Compile.
5. Observe errors.
6. Expected behavior: no errors.