[ci] fix: fix ci

[vermouth1992]

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[gemini-code-assist]

Code Review

This pull request aims to fix the continuous integration (CI) pipeline by ensuring that hardware-specific tests are only executed on the appropriate hardware. This is achieved by adding pytest.mark.skipif decorators to skip hccl tests on non-NPU devices and nccl tests on non-CUDA devices. An __init__.py file has also been added to the tests/checkpoint_engine directory, which correctly turns it into a Python package, likely to resolve test discovery or import issues in the CI environment. The changes are correct and follow standard practices for managing hardware-dependent tests. The review did not identify any issues of high or critical severity.