Validate that VT adapter tests cover all mock possibilities

All of the various mock definitions don't seem to be in use. When I stood up the original parser years ago and wrote the mock, every mock was checked somehow. Over time, it probably decayed and the only thing left is that the mock has to be implemented to satisfy compilation of the interface.

Originally posted by @miniksa in https://github.com/microsoft/terminal/pull/891/review_comment/create

The goal here would be to run through all the tests and ensure that the mocks are involved somehow in each operation to validate that we're getting what we expect back through the adapter interface for all potential results.