Handling warnings in pytest

[vlad-perevezentsev]

This PR suggests getting rid of use -p warnings flag in pytest configuration and handling warnings separately. This will help to see new warnings during development

• [X] Have you provided a meaningful PR description?
• [ ] Have you added a test, reproducer or referred to issue with a reproducer?
• [ ] Have you tested your changes locally for CPU and GPU devices?
• [ ] Have you made sure that new changes do not introduce compiler warnings?
• [ ] Have you checked performance impact of proposed changes?
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[github-actions[bot]]

View rendered docs @ https://intelpython.github.io/dpnp/index.html

[antonwolfy]

There are still warnings on PVC:

=========================================================================================== warnings summary ===========================================================================================
tests/test_sycl_queue.py::test_from_dlpack_with_dpt[complex64-level_zero:gpu:0]
tests/test_sycl_queue.py::test_from_dlpack_with_dpt[complex64-level_zero:gpu:1]
  /home/gta/miniconda3/envs/dpnp_dev/lib/python3.10/site-packages/numpy/testing/_private/utils.py:722: RuntimeWarning: invalid value encountered in equal
    func=lambda xy: xy == +inf,

tests/test_sycl_queue.py::test_from_dlpack_with_dpt[complex64-level_zero:gpu:0]
tests/test_sycl_queue.py::test_from_dlpack_with_dpt[complex64-level_zero:gpu:1]
  /home/gta/miniconda3/envs/dpnp_dev/lib/python3.10/site-packages/numpy/testing/_private/utils.py:725: RuntimeWarning: invalid value encountered in equal
    func=lambda xy: xy == -inf,