Emitting invalid code for async inherited tests

[thomhurst]

Thanks for looking at this @thomhurst

Unfortunately the new release has broken inherited tests in the case where the tests are async, the generated code is invalid in this case (it works for void methods though).

If you try updating the repro shared before with the newest version you should see the error: https://github.com/slang25/tunit-category-bug/

Originally posted by @slang25 in #2880

[slang25]

That works great @thomhurst, thanks 🙂

Now I just need to wait for this 😅 https://youtrack.jetbrains.com/issue/RSRP-501200/Unit-tests-discovered-using-Microsoft-Testing-Platform-do-not-have-their-category-detected