add unit tests for ucc transpiler passes

[jordandsullivan]

Testing that each of the ucc default transpiler passes individually does what is expected. Qiskit has a pretty hefty testing suite, and we probably don't need all of it right now, but Qiskit's transpiler tests provide some code that can be reused. However, they are using Unittest and I am more familiar with Pytest, so I may not directly copy the files.

@jordandsullivan to do a deep dive in the Qiskit testing suite to determine the minimum we need for UCC