The GitHub Actions job "tvm-bot" on tvm.git/main has failed.
Run started by GitHub user tlopex (triggered by tlopex).

Head commit for run:
1a764d799316c7d73123750a0a3f7ce40c7d5cba / Shushi Hong <[email protected]>
[Tests] Reduce runtime of slow Python tests (#20006)

This PR reduces the runtime of several slow Python test groups:

- Parameterize LLVM division and CUDA vectorized-cast cases so
pytest-xdist can schedule them independently.
- Replace exhaustive ONNX execution with structural importer checks plus
representative numerical cases, and avoid registering unsupported
backend cases.
- Reuse compiled paged-attention kernels across compatible test cases.

Targeted measurements showed:

- LLVM division: 25.34s → 19.87s
- CUDA vectorized casts: 142.85s → 108.40s
- Paged-attention CPU: 316.32s → 192.50s
- ONNX Conv: 25.84s → 1.81s
- ONNX Reduce: 20.66s → 4.04s

This PR also fixes a latent CUDA Graph cleanup bug that could leave
`cudaErrorStreamCaptureInvalidated` in the worker thread and cause
unrelated subsequent GPU tests to fail.

Report URL: https://github.com/apache/tvm/actions/runs/29456763618

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