`cuda-bindings` examples are not run as part of the CI

By inspecting @rwgk's test plan renewal I realized we missed this when we modernized the test and CI infrastructures. We need to follow `cuda-core` and make them tested through pytest:
https://github.com/NVIDIA/cuda-python/tree/main/cuda_core/tests/example_tests
Then we don't need to run them as a separate test job.