Add testing for L0_iterative_tutorial

[Tabrizian]

https://github.com/triton-inference-server/tutorials/pull/90

[Tabrizian]

@oandreeva-nv I think we did this for Python backend but the feedback was that it makes it harder to determine which part of the test is flaky since they are all bundled together. Additionally, the tests can be executed in parallel if they are separate.