[1/N][Test] Add hw_classification to `TestSparseCSRSampler` class (#193170)

- reformat imports in `test_sparse_csr.py`
- add hardware classification to `TestSparseCSRSampler`

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This is a stack of PRs with the goal to enable XPU for `test_sparse_csr.py`:
- -> https://github.com/pytorch/pytorch/pull/193170
- https://github.com/pytorch/pytorch/pull/193171
- https://github.com/pytorch/pytorch/pull/193175
- https://github.com/pytorch/pytorch/pull/193179
Pull Request resolved: https://github.com/pytorch/pytorch/pull/193170
Approved by: https://github.com/CuiYifeng, https://github.com/etaf, https://github.com/jansel